Fixing and restoring a 1960s LC meter (BM 366) with vacuum tubes made by Czechoslovak Tesla. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Duracell AA batteries never leak, except in my DIY numitron clock. Fixing the battery leakage damage and converting it from two AA to a 3V CR2032 lithium backup battery. The numitron clock on my website: https://danyk.cz/avr_num_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a headlamp made by Sigg, replacing the red LEDs with phosphor yellow ones (which are like very warm white LEDs, unlike standard yellow LEDs). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a cheap ATX computer power supply from a scrap yard, how does it work, why it was scrapped. Can I fix it? How to test SMPS components (transistors, diodes, electrolytic capacitors...). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring an LG LCD television set from a dumpster. What's inside and how does it work. Reverse engineering a simplified schematic of the switching power supply and the CCFL inverter. A very cheap repair. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Restoring a BM 368 vacuum tube high frequency generator produced by Czechoslovak Tesla in the 1960s and 1970s. This device on my website: https://danyk.cz/bm368_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing two donated 12V 1A switching power supplies for a wifi router, what's inside, how do they work. Examining the quality and safety, thermal imaging, output voltage ripple, waveforms, reverse engineered schematic. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing the HRM-10 internal resistance tester (meter) from Fnirsi. It's intended to measure the internal resistance and the voltage of batteries, but it also seems to be able to measure the ESR of electrolytic capacitors and supercapacitors, and even resistances (resistors) down to sub milliohm values. This is possible thanks to its 4-wire Kelvin probes. https://fnirsi.top/3XruYnr https://s.click.aliexpress.com/e/_olrveNH Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a 10W (700lm) zoomable multipurpose LED flashlight with a 1W (80lm) white and red side light from Lidl supermarket. It contains a Li-ion cell and it is rechargeable using a USB-C port. Testing it and doing some modifications. Disabling the annoying flashing (strobe) and SOS modes. Changing the side light from cool white to warm white. Changing the button backlight from blue to yellow. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing a digital stopwatch (or stopclock) with nixie tubes from the early 1980s made by ZPA Pragotron in Czechoslovakia. Exploring what's inside and how does it work, thermal imaging, explaining the schematic with a 7400 TTL logic, building a replacement for the missing remote control. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild This stopwatch on my website: https://danyk.cz/ds35_en.html Instagram: https://www.instagram.com/savage_danyk/

What's inside a Dell 495W server switching power supply, including the simplified schematic and how does it work. This is a less common topology, a double boost circuit (active PFC and a pre-regulator) followed by a synchronously rectified isolated halfbridge converter with no output inductor (probably non-PWM). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and opening a 40W "GaN" charger with 2 USB-C ports from AliExpress for 15 USD. Is it going to be better than the 3 USD charger? Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing a soviet cassette tape recorder Vesna 309 (Весна 309) and exploring what's inside. It has an AC erase / bias and a brushless DC motor. This time, the problem is NOT the capacitors! Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing a 3-36V 60W adjustable switching power supply KJS-1509 made by Kejiesheng. It's in a laptop power supply shaped box with a potentiometer and a built in 3 digit LED display voltmeter. Let's see if it's any good, what's inside, how safe (or dangerous) it is and how does it work, including the full reverse engineered schematic. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring what's inside a tankless water heater (also called on-demand, continuous flow, inline or instantaneous water heater). How does it work, what failed in it, could it be fixed? It's using a 3.5kW bare wire heater and a regulation with a microcontroller and a triac. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

I continue working on the 1990s Tektronix TDS744A digital 4-channel 500 MHz oscilloscope. My plan was to fix the colors, but I ended up taking a closer look at the switching power supply board, testing and replacing a lot of high ESR electrolytic capacitors, fixing a board damage from electrolyte leakage and relubricating the fan. I did some experiments with the sequential color system. The color shutter has no voltage going into it. There's definitely a problem in its driver, but the shutter itself might be deteriorated too. For now, I decided to remove the color shutter. This gives me a bright monochrome picture. The oscilloscope is perfectly usable this way. I might try to put the shutter back in and fix its driver, but I'm not sure I want to spend my time on it, risking an accidental damage, as this oscilloscope is perfectly usable as it is now. This old Tektronix oscilloscope uses a CRT-LCD hybrid display technology - a monochrome CRT tube with a solid state sequential color filter (liquid crystal color shutter / LCCS / LCS / NuColor). The 1st episode: https://youtu.be/RSEwT7ZNQZU Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a 1990s Tektronix TDS744A digital 4-channel 500 MHz oscilloscope, fixing it. One channel has a huge DC offset. The monitor has some problems - the colors are not working, it shows weird dissolving circles. It's a CRT-LCD hybrid - a monochrome CRT tube with a solid state sequential color filter (liquid crystal color shutter / LCCS / LCS / NuColor). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Can 3 USD really buy you a 65W GaN USB charger? Let's test it and see what's inside. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a dimmable 150W Philips LED power supply and how does it work. Including a reverse engineered schematic of the power section, some tests, measurements and oscilloscope waveforms. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing some sodium ion 3V 1300mAh 18650 cells from AliExpress made by Seekwatt. Measuring the mAh capacity, Wh energy and the charge and discharge curves. Na-ion batteries use much more abundant sodium instead of rare lithium. Are they the future of large scale energy storage? Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing suspicious LT1006CN8 and TLE2141CP operational amplifiers from eBay. How to test the output voltage swing (low and high state output voltage) and the common mode input voltage range. These are obviously fake and both behave exactly the same, despite having a different marking and coming from different sellers. The output voltage swing is quite poor on the negative side. The common mode input voltage range doesn't cover V- as it should (they're not actually ground sense op-amps). They don't meet their datasheet specifications. UPDATE: I got refunded for both types. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Explaining the basics of OpAmps (Operational amplifiers) for beginners, how an OpAmp differs from a comparator, how to read OpAmp datasheets. What the OpAmp pins do. An inverting and a non-inverting amplifier, the gain. Symmetrical (double) vs. non-symmetrical (single) supply voltage operation. The output voltage swing and the common mode input voltage range, rail to rail and ground-sense OpAmps. The input voltage offset and the offset null potentiometer. Bipolar vs. FET OpAmps, bias select. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

How to build your own battery capacity meter. It measures the capacity of any rechargeable or single-use battery (Li-ion, Li-Pol, LiFePO, Sodium ion, NiMH, NiCd, Lead-acid, Alkaline, Zinc-carbon, Lithium...) in Ah or mAh and the energy in it in Wh. It works for single cells or battery packs up to 20V. The discharge rate can be set from 0.01 to 2.56A, there's also a 0.02 to 5.12A double current version. The schematic, description and the program: https://danyk.cz/avr_aku2_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing a beta and gamma ionising radiation sensor from Aranet, what's inside. It can measure the dose rate and the total dose using a solid state PIN diode sensor, sensitive in a 70–1500 keV range, 0–1000 μSv/h. Wireless access to settings and history through Aranet Home app. https://bit.ly/3U2drSv 5% off in their web-shop (Aranet Radiation, Aranet4 HOME, Aranet2 HOME). Discount code: DIODE Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

This time a pair of revolutionary but ultra dangerous USB chargers. A green low-power environmentally friendly planet-saving charger and an unlimited charging power charger (limited VIP edition). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Trying to fix another Ford IMRC (Intake Manifold Runner Control valve) module. This time it's not so easy. A tricky situation when it doesn't work, yet all components appear good. The previous (easy) one: https://youtu.be/EJCvyOo1CmY Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing DPOX180H from Fnirsi - a two channel 180MHz handheld digital phosphor oscilloscope with a built-in function generator, XY mode, FFT and a lot more. Including a peek what's inside and a capacity test of its 3000mAh Li-ion battery. https://s.click.aliexpress.com/e/_oCbuHdE Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

The Tesla BM556 analog oscilloscope from 1982 is finally fully working! More high ESR and open circuit electrolytic capacitors, a bad LED and a problematic paper capacitor in an interference suppression filter module. The 1st episode: https://youtu.be/JYR6D2rZoQE Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Two more of hazardous quick USB phone chargers. They can't supply the current and power they claim, they overheat. They don't comply with safety regulations. They can cause an electric shock, fire or electromagnetic interference (EMI). A load test, what's inside, output voltage ripple, thermal imaging and transformer insulation safety analysis. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Explaining the 555 chip bistable circuits. Examples of 1-button and 2-button ON-OFF circuits for beginners. Simple schematics and how do they work. The 1st episode: https://youtu.be/qgF1PaRuUhQ Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a bread machine and how does it work, fixing it (it doesn't mix). Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing the NiCd 4.8V battery backup inverter from the 2x 58W fluorescent fixture. What's inside, including the schematic. How does a Royer oscillator work and the voltage waveforms in it on an oscilloscope. Note: This is the resonant version of the Royer oscillator, not the original saturable-core transformer version, so more accurately it should be called a Baxandall oscillator. The 2x 58W mains power inverter: https://youtu.be/dRB9xzjPngY Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a 2x 58W electronic fluorescent tube ballast (inverter) and how does it work. Including a reverse engineered schematic and some oscilloscope waveforms. Experiments with electronic fluorescent fixtures, one with a 4.8V NiCd battery backup inverter, which I might explore in another video. The battery backup inverter: https://youtu.be/7bsmc8b2lM8 Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Explaining the 555 timer/oscillator chip and what each pin does. Example oscillator circuits for beginners - an LED blinker, changing the frequency and the duty cycle. A beeper and a 2-tone siren with the 555 chip, adjusting the frequency using a potentiometer. Simple schematics easy to understand for newbies. The next episode: https://youtu.be/nF2-RAUFKio Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Measuring the degradation (health / remaining capacity) of a 6.5 years old Li-ion LG Chem battery pack. It's 25.55V 2000mAh 51.1Wh 7S battery pack that was used in a Rowenta 25.2V cordless vacuum cleaner. It contains 7 18650 cells marked LGEAMF11865. The vacuum cleaner video: https://youtu.be/NuKNOV5SKN8 Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Analyzing a cordless Li-ion vacuum cleaner from a dumpster. What's inside and how does it work? What failed in it, why it was scrapped? Could it be fixed? If not, what useful components could be salvaged? Rowenta Air Force Extreme Vision Pro with a rechargeable 25.2V 2000mAh Li-ion battery pack made by LG Chem. The battery pack teardown and capacity test: https://youtu.be/sEVWvXhju3s Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Some experimentation - testing if an asynchronous motor could be used as an offline generator. Trying various resonant capacitors for self-excitation and priming the rotor. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Explaining how an induction AC motor works (synchronous / asynchronous). Measuring the speed of some asynchronous motors using a strobe light method. Connecting and LED to a function generator and a frequency meter to create an accurate RPM meter. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing an intelligent color screen multimeter DMT-99 from Fnirsi and exploring what's inside. This multimeter on aliexpress: https://s.click.aliexpress.com/e/_ol9foCk Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Repairing a USB phone charger from Lenovo. How to test components in a switching power supply and find the failure. Sometimes the problem can be a bad solder joint instead of a faulty component. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring what's inside a high voltage insulation tester type XS made by Ganz probably between 1978 and 1981 (The potentiometer is from 1978, the baterries from 1981, but they might not be the first batteries in it). It uses 100V, 250V, 500V or 1000V to measure the insulation resistance in two MΩ ranges and 1.5V to measure in the kΩ range. All the transistors in it seem to be Germanium. It runs on 7 D cells. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild My online calculator: https://ohmslaw.eu Instagram: https://www.instagram.com/savage_danyk/

Talking about the temperature drift of the resistance of a copper (aluminium) wire or winding. Using the Temperature Coefficient of Resistance (TCR) to calculate the resistance from the temperature or the temperature from the resistance. Real life experiments with the resistance thermal drift in a transformer and a fluorescent inductor winding. Estimating the temperature of a winding based on its resistance change. Resistance thermal change calculation added to my online calculator: https://ohmslaw.eu Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing a 24V 10A 240W switching power supply module donated by a viewer. He tried to fix it, but couldn't find the fault. Everyone keeps learning during their whole life. No-one knows everything. Showing how to diagnose this 2-switch forward SMPS, so he (and other beginners) will be wiser next time. Testing transistors can be tricky. Neither I am perfect, I took the longer path this time :). The tricky situation when something with seemingly no bad components isn't working! Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a fluorescent fixture that automatically lights up during power outages. An 8W T5 fluorescent tube with an inverter, a battery and a small transformer for charging. I reverse engineered the schematic, explained how does it work and measured the tube voltage and current waveforms on an oscilloscope. Trying to modify the fixture to operate on mains voltage using a magnetic ballast. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Repairing the time base of the Tesla BM556 analog oscilloscope from 1982. Testing some transistors, diodes, resistors and capacitors, talking about in-circuit testing. Finally, the problem turned out to be a germanium tunnel diode GE134. I don't have the exact type, so I went through datasheets of soviet tunnel diodes and chose the most similar one - GI304A. The next episode: https://youtu.be/pn63yMTxwfA The 1st episode: https://youtu.be/JYR6D2rZoQE Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring what's inside a 1980's milliohmmeter and how does it work, repairing it. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

A traditional iron Microwave Oven Transformer (MOT) has a switching alternative. Exploring a donated SMPS board from an inverter based microwave oven where the heater voltage and the high anode voltage (about 4kV) for the magnetron is generated using a switching power supply with IGBT transistors and a ferrite HV transformer. Including the schematic of the power section. And some warning about the danger of microwave oven transformers! CAUTION: Don't do what I do in this video. EXTREME DANGER! The online calculator: https://ohmslaw.eu Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Experiments with some fluorescent tube fixtures with traditional magnetic ballasts (iron inductors). Comparing standard glow switch starters with an electronic starter, exploring what's inside. Reverse engineering the electronic fluorescent starter schematic and explaining how does it work. Some oscilloscope waveforms. Thanks for the donated electronic starters ;). Correction: they turn on after 1 cycle, not halfcycle. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Yet another pair of questionable USB phone chargers. They don't comply with safety regulations, they can cause an electric shock, fire or electromagnetic interference (EMI). One is a Quick Charge 3.0 charger rated 5V/3A, 9V/2A, 12V/1.6A (not really), the other is a small 5V/1A charger (again a fake current rating). Let's test them, see what's inside and how do they work, including the schematic of the fast charger. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Opening a 12W Livarno Lux LED lamp that stopped working to see what failed in it. Reverse engineering the power supply schematic, how does it work, oscilloscope waveforms. Explaining an inverting buck–boost switching converter. Do NOT try to repeat what you see in this video! Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Electrodeless induction fluorescent lamp fixture teardown. Disassembly, how does it work, what's inside the power supply, reverse engineering the schematic, showing the waveforms on oscilloscopes. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Dangerous USB (phone) chargers are getting better. Analyzing two donated chargers, both of them turn out to be acceptable. The quality and safety is definitely much better than the typical cheap Chinese chargers (no name / fakes / clones) that you see in my endless "Dangerous USB chargers" series. In this pair, the risk of electric shock, fire and EMI interference seems low enough. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Finishing the solar powered thermometer (-40 ... +99.9°C) with supercapacitors. Talking about prototyping boards, putting it into a plastic box, showing some supercapacitor calculations, ice bath temperature sensor test, waterproofing it for outdoor temperature measurement. And most importantly, no Arduino, no hot melt glue, no Li-ion battery and only 1 zip tie used! This thermometer on my website, with the schematic and program: https://danyk.cz/avr_tep1c_en.html The previous episode: https://youtu.be/1a_3r6CH3-Y The green LED laboratory thermometer: https://youtu.be/Yj95Mxdxagw Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring what's inside an LED traffic light and how does it work, fixing its fault. Thanks for the donation! Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

1982 Tesla BM556 analog oscilloscope repair continues. Now I've fixed the brightness control problem. It was caused by bad capacitors in the high voltage switching power supply, which also produces the CRT heater voltage. Now the heater voltage is stable, no more fluctuations. Measuring and explaining the ESR of electrolytic capacitors and the leakage current. In the next episode, I have to fix the bad synchronisation. The next episode: https://youtu.be/T0djivQw9iY The 1st episode: https://youtu.be/JYR6D2rZoQE Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Restoring a BM556 analog oscilloscope made by Tesla in Czechoslovakia in 1982. Fixing broken and stuck front panel controls, things out of alignment, wires coming off, high voltage arcing and even some smoke! Also a brightness control problem, suspecting a worn CRT, fluctuating heater voltage, testing some transistors. The problem with the heater voltage (coming from the HV power supply) still has to be solved, as well as the bad time base or synchronisation. The next episode: https://youtu.be/qPkBBLfz3Gg Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside the oldest Czech hydro power plant in Písek, generating electricity since 1887 (before this, it was a water mill). Water turbines, wooden gears and a flat belt transmission! Sadly, the generator isn't the original one any more. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What can be a worse nightmare than repairing something that someone else tried (and failed) to fix, causing even more problems in the process. Let's fix the 2nd nixie multimeter - the one full of botches and modifications. This is M1T-242 made by Metra Blansko in Czechoslovakia in 1986. Making the reed relay: https://youtu.be/3wyDibjtgFM Repairing the other M1T-242: https://youtu.be/60mclbNGJu4 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Making my own reed relay using a reed switch and winding a 5V coil for it. Simulating the solenoid coil using my online calculator to reach the right coil resistance. My old online calculator: https://danyk.cz/vypocty.html The multimeter this coil was put in: https://youtu.be/J3p7j5ElZ6Q Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing an old bench multimeter M1T 242 with a nixie tube display and autorange function. It measures AC and DC voltages, currents and resistances in 4 ranges. It was made in Czechoslovakia in 1987 by Metra Blansko, mostly using Tesla components. The online calculator: https://ohmslaw.eu The 2nd multimeter: https://youtu.be/J3p7j5ElZ6Q Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Visualizing the current-voltage characteristic of a solar cell using a very simple DIY circuit. Transformer method and function generator method. Then also tracing the illumination-voltage and illumination-current curves. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Experimenting with solar panels in indoor conditions and supercapacitors as solar energy storage. Testing some cheap eBay solar cells. Trying to use them to power a digital thermometer. Also criticising the lack of understanding that renewable power sources still can't fully replace traditional sources. And shortly after hearing about the Titan fatal failure, I just couldn't stop myself from criticising the extremely poor design of a safety critical structure (and whatever could have led to it, maybe bad hiring practices, but I only know what I've read and heard about it). The next episode: https://youtu.be/AeL-nnhE7xo The previous LED thermometer: https://youtu.be/Yj95Mxdxagw Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

How to build a super simple DIY curve tracer for your analog or digital oscilloscope. Curve tracing Zener diodes, LEDs, a capacitor, a resistor, TL431 and a diac using an oscilloscope in XY mode. Measuring the thermal drift of various Zeners. The previous part: https://youtu.be/M6SwFOVdFcs Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Correcting some misconceptions about a Zener diode as a perfect voltage limiter, regulator or reference. Many beginners believe, that its reverse voltage drop (Zener voltage) is absolutely stable. In reality, the Zener voltage can vary depending on the reverse current and the temperature. Measuring the real life current–voltage characteristics of some Zener diodes. The next part: https://youtu.be/5Cu1PKj_2-s Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Electricity saving boxes have evolved into Power factor savers. Not just the name has changed, but also the internals. Let's make an autopsy, including the "capacitor" for inductive load compensation and spike suppression. A few years ago, they were still using real capacitors, but in either case, it doesn't save you any electricity. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Biasing the pair of power transistors (NPN + PNP) in the output amplifier of my function generator (TR-0458/B). The previous owner probably changed the transistors, but they also needed to be re-biased, as their base to emitter voltage drop was higher. They were under-biased, causing signal distortion. The same can apply to bipolar discrete transistor audio amplifiers. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's try to fix a TR-0458/B function generator made in Hungary probably in the early 1980s. This is a 0.0001Hz to 1MHz function generator (sine wave, square wave, triangle wave, sawtooth) with 58 transistors and 4 OpAmps. Finding the faulty component, aligning it, the schematic, how does it work. The schematic: http://www.blunk-electronic.de/datasheet/schematics/tr-0458-emg12564b.pdf Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Taking a look at and into an old big oscilloscope with a round CRT. You'd expect this heavy crude tank to be full of tubes, but... this is Czechoslovak KŘIŽÍK T565/531-79. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Explaining the evolution of battery powered analog clocks (electric - electronic - quartz), repairing (restoring?) a 1960s Ruhla "electric" clock - a mechanical clock that winds itself using a battery and an electromagnet. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing a handheld thermal imaging camera from Topdon - TC004. Product link: https://eu.topdon.com/products/tc004 15% Off Discount Code: TOPDON04 End Date: July 7 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Examining a pair of fake "fast" USB phone chargers. They don't comply with safety regulations, they can cause an electric shock or electromagnetic interference (EMI). The fast charging function (9V, 12V) is non-existent, in reality they can only supply 5V. One has a fake built-in voltmeter. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing an intelligent electric soldering iron (HS-01) from Fnirsi. https://s.click.aliexpress.com/e/_oC5BF4z Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Repairing the donated 35W electronic USB test load that I damaged by a too high power dissipation or more likely a too high voltage. Some websites say it is 4-30V, some say 3-21V, but I've accidentally connected it to 36V. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's build a DIY test load to test USB chargers and other power supplies. It can operate at 4 to 30V supply voltage and draw an adjustable current from 0 to 4A. Warning: it can get very hot, risk of fire or burns! Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Building a simple 2.2 - 5.5V adjustable linear bench power supply. This time, the current limit circuitry uses just discrete transistors. How to compensate the temperature drift of a bipolar silicon transistor B-E junction using a Schottky diode. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing a tiny thermal camera - InfiRay P2Pro. It plugs into a USB-C port of an Android smartphone (Ios version also exists). The thermal sensor says 256x192 pixels. This thermal camera on Amazon: https://www.amazon.de/dp/B0BK92BRHL code: diodegone Offical website: https://www.xinfrared.com/products/infiray_p2_pro_thermal_camera code: diodegone Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

How to build a simple DIY wooden table. My trash woodworking with trash material and trash tools. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Opening a donated faulty USB-C fast charger made by AlzaPower with up to 65W output power, testing all of its components, finding the failure and repairing it. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing an SG-004A signal generator, made and donated by Fnirsi, taking a peek inside. Not a typical signal generator, probably should be called a process calibrator. It's good to read and simulate various sensors (pressure, temperature, motor or engine speed...), process parameters, to test actuators, for development and calibration in automation systems and such. It can read, simulate and convert sensor signals in the form of a voltage, current, frequency, PWM duty cycle, ... https://s.click.aliexpress.com/e/_o2dFf6v Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing an IMRC (Intake Manifold Runner Control valve) module from Ford Focus ST170. Exploring what's inside. Testing all the electronic components in it (the TO220 power Darlington NPN transistor, small PNP SMD transistor, diodes, resistors, capacitors, motor and contacts). Finding the faulty component and replacing it. UPDATE: It's back in the car, it seems to work, no errors, passed the emissions test. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing a GD166B AC/DC clamp meter with smart multimeter functions and exploring what's inside. https://www.aliexpress.com/item/1005005251839256.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Finally fixing this vintage linear bench power supply (AUL210 made by ZPA Košíře závod Děčín in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs with thyristor (SCR) pre-regulation, two 15V 1A outputs and one 5V 2A output. I found and repaired the problem in the faulty 15V section. I also fixed an unexpected bridge rectifier problem in the other 15V section. Some more electrolytic capacitors tested and replaced. Adjusting the feedback PID to prevent unwanted oscillations. A leaking, shorting and exploding paper capacitor in an interference filter. Some oscilloscope measurements in the thyristor controlled rectifier section that pre-regulates the voltage. The 1st episode: https://youtu.be/fRdSxuZ80sY Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Another episode of the repair journey of this vintage linear bench power supply (AUL210 made by ZPA Košíře závod Děčín in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs with thyristor (SCR) pre-regulation, two 15V 1A outputs and one 5V 2A output. Replacing the mains cable and some paper capacitors, testing the ESR of electrolytic capacitors. Trying to find the problem in the 15V section. How to test resistors, diodes, potentiometers, capacitors and transistors using a multimeter. The 1st episode: https://youtu.be/fRdSxuZ80sY The 4th episode: https://youtu.be/bWxS2njU-JI Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Recording the voltage curves during constant current charging and discharging, resistive discharging and self-discharging of various supercapacitors from eBay and from a trusted supplier using a digital oscilloscope and a DIY oscilloscope. Memory effect / forming supercapacitors. Some calculations and ESR measurements. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and opening a questionable Chinese LED night light with an amazing Chinglish description. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing a smart multimeter (type S1) made and donated by Fnirsi, then opening it and exploring the internals. https://s.click.aliexpress.com/e/_oEyDep7 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring some wireless communication transmitter and receiver modules from eBay. They operate at 433.92 MHz RF frequency. Some tests, oscilloscope measurements, schematics and how do they work. Correction: dBm means decibel milliwatts, not decibel meters, but the abbreviation easily leads to confusions. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Measuring the self discharge of some EDLC supercapacitors (500F 2.7V "Samwha" from eBay, 60F 2.8V from Bigcap) and noticing some weird memory effect. The charging curve. Comparing the energy density of a supercapacitor to a Li-Ion battery. The catculator: https://ohmslaw.eu Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

A weird oddity I've noticed in these LED displays (OPD-Q5620LY-BW and OPD-Q5620LA-BW). The colon always lights up together with the decimal point. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, a completely unplanned restoration of an old air pump for car or bicycle tyres. I was going to just find out how does this vintage hand tool work and quickly fix it. During the video, I decided to restore it :). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

I continue working on the vintage bench power supply (AUL210 made by ZPA Košíře in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs, two 15V 1A outputs and one 5V 2A output. An adventurous repair journey of this cool old linear power supply with thyristors :). The 1st episode: https://youtu.be/fRdSxuZ80sY The 3rd episode: https://youtu.be/8019c7ntXYU Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

How to measure the capacitance of a supercapacitor. Using a constant current charge and a resistive discharge methods to estimate the EDLC supercapacitor's capacitance. The calculator: https://ohmslaw.eu Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's boast of my new website - an online calculator for formulas used in electronic circuit designs. It's still under construction. It will be able to calculate the Ohm's law, DC power, AC power, Resistive load power, resistor power dissipation, LC resonant frequency, inductive and capacitive current, inductive and capacitive reactance, wire resistance, wire weight, wire cross section and diameter, LED resistor, capacitor stored energy, and some more calculations... Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's fix and restore a vintage bench power supply (AUL210 made by ZPA Košíře in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs, two 15V 1A outputs and one 5V 2A output. An adventurous repair journey of a cool old machine :). The 2nd episode: https://youtu.be/kTTdESQgE6Y Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

A pair of small 5V 1A USB chargers, what's inside, checking the safety, interference and quality. The first one was a part of handheld oscilloscope accessories, the second one is from eBay. Let's see what surprises are hidden inside of them. Some chargers may not comply with safety regulations, cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can cause electromagnetic interference (EMI) or damage your USB devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and opening 1C15 digital oscilloscope from Fnirsi. It's a battery powered handheld oscilloscope with 1 channel and 110 MHz bandwidth, 500 Msps, 24 kpts memory depth, 20mV/div - 100V/div, 5ns/div - 10s/div. https://s.click.aliexpress.com/e/_oCXoZM9 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Building a small linear bench power supply with an adjustable output voltage (1.25 to 15V) and current limit (0 to 350mA). Choosing the transformer, explaining the schematic and how does it work, some tests. This power supply on my website: https://danyk.cz/minizdroj2_en.html The 5.5V power supply: https://youtu.be/1kIv1s98PBE Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and exploring a USB fast charge tester FNB58 made by Fnirsi. Let's see what it can do and what's inside. https://s.click.aliexpress.com/e/_ol4iFah Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, I removed the infrared filter from the camera in my webcam + CD based DIY spectrometer. I measure the visible and infrared spectra of daylight, laptop LCD monitor, tungsten lamp, fluorescent lamp, germicidal UVC lamp, sodium and mercury discharge lamp, neon lamp, nixie tube, remote control infrared LEDs and so on. The previous episode: https://youtu.be/p3MzQ1OF3lk Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

How to build a DIY spectrometer using just a black box with a slit, USB webcam and a CD or DVD disc (or a prism). The spectrum of the incoming light is analyzed and displayed on a computer using Theremino program, including a surprisingly good wavelength measurement. The next episode: https://youtu.be/4-kPvot_QsQ Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/ Building my circadian LED lamp: https://youtu.be/mhbntwPr3wk

No worries, not a death ray. Just a sleep ray. Building yet another blue-free and cyan-free amber LED lamp that doesn't suppress your melatonin production and won't disturb your circadian rhythm when used during evenings. This might improve your sleep. This time a DIY 0.87W plug-in version that goes into a wall socket, with a switch and a tiny 0.002W indicator to find it in a dark room. The building process and the schematic. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/ The LEDs: Red: FYLS-2835PURC-0.2W or RF-OURI35TS-CH-N Yellow: FYLS-2835PUYC-0.2W or RF-YURI35TS-AF-N or OF-SMD2835Y Phosphor yellow: FYLS-2835UYY-0.5W

Testing how much current is needed to blow 100mA 5x20mm glass fuses. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Building another sleep lamp, this time a small one, including the schematic, with orange light (red + yellow LEDs). A homemade blue-free light source that doesn't suppress your melatonin production, won't disturb your circadian rhythm and improves the quality of your sleep (or at least it's supposed to). The big sleep LED: https://youtu.be/mhbntwPr3wk Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/ The red LEDs: RF-OURI35TS-CH-N (or FYLS-2835PURC-0.2W) The phosphor yellow LEDs: FYLS-2835UYY-0.5W

How to build your own DIY sleep LED lamp, including the schematic. A homemade blue-free and cyan-free light source that doesn't suppress your melatonin production and won't disturb your circadian rhythm. This can improve your sleep. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/ The red LEDs: FYLS-2835PURC-0.2W (or RF-OURI35TS-CH-N) The yellow LEDs: FYLS-2835PUYC-0.2W The phosphor yellow LEDs: FYLS-2835UYY-0.5W The yellow-green LEDs: RF-GSRA30TS-BC (or LTST-T680KGWT)

Exploring what's inside a big but dim LED lamp from eBay with no power rating, including a test and the schematic. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Testing and opening a WD-01 wall scanner (wall detector) from Fnirsi. It can find live AC wires, metal objects and wooden beams (studs) inside walls. It has a depth indication and it can even locate the center and edges for wooden beams and tell magnetic metals from non-magnetic. This Wall Scanner: https://s.click.aliexpress.com/e/_oF0R6cN The Nuclear Radiation Detector: https://s.click.aliexpress.com/e/_oDoFQu5 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Unboxing, testing and opening a GC-01 nuclear radiation detector from Fnirsi. It uses a Geiger counter tube. Showing how to use it, testing it using various mildly radioactive objects and exploring what's inside. The battery can last for about 11 hours. This Nuclear Radiation Detector: https://s.click.aliexpress.com/e/_oDoFQu5 The Wall Scanner: https://s.click.aliexpress.com/e/_oF0R6cN Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Analyzing a dubious 5V 3A USB charger with 4 ports, a switch and a mains plug on a cable. Let's see what surprises and dangers are hidden inside. Some power supplies and chargers may not comply with safety regulations. They cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can cause electromagnetic interference (EMI) or damage your USB devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Powering the monitor from the video door-phone with a flat CRT tube. Some experiments with the adjustment potentiometers. Then showing some PAL video signal and deflection waveforms on my oscilloscopes. Also measuring the heater and grid voltages. The previous episode - visual inspection: https://youtu.be/j-0GFb4z4yY Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Repairing a broken hinge of a laptop. I'm absolutely no expert on laptops :). Quick fix botchwork, you can as well call it "how not to fix a laptop" if you prefer. Gluing back and reinforcing the brass inserts (with inner thread for screws) that came loose out of the plastic. Trying the super glue and baking soda method. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a video doorbell intercom with a flat CRT screen from 2003. A flat display technology before LCD's. Warning: don't do what you see in this video. Risk of electric shock or injury. The next episode - in operation, experiments, waveforms: https://youtu.be/l9CXZXSwG7I Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and opening a USB phone charger with two ports, 5V 2.1A in total, donated by a viewer from Australia. Let's see what's inside and how safe (or dangerous) it is. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today I explore the mysterious mechanism of an old synchroscope that was used to synchronize a power plant AC generator with the power grid (mains). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's explore an electric model of a V2 engine donated by Stirlingkit. Extra 10% off code: DK V2 Engine: https://bit.ly/3QifrBA Electromagnet Motor: https://bit.ly/3JYZQok Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing another pair of USB chargers, what's inside, checking the safety and build quality. Both are rated 5V 1A, one from eBay, one donated by a viewer. Let's see what surprises and dangers are hidden inside of them. Some chargers may not comply with safety regulations, cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can cause electromagnetic interference (EMI) or damage your USB devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

After a long time, one more crappy unedited shaky blurry video that makes everyone unsubscribe. Showing my old homemade intercom, explaining the schematic, some improvements and also some random thoughts on the downsides of too complex electronics. This intercom on my website: https://danyk.cz/dom_tel_en.html Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Building a portable LED digital thermometer with maximum and minimum memory. The second version has adjustable brightness of the display. The 1st version with ATmega8A (ATmega8L): https://danyk.cz/avr_tep1_en.html The 2nd version with ATmega88PA (ATmega88): https://danyk.cz/avr_tep1b_en.html Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Building a ring tester that can test transformers and inductors for short turns, even in a circuitboard. It can easily identify shorted windings, including just 1 short turn. Irreplaceable, especially when fixing switching power supplies and inverters, but also for vintage CRT television and monitor high voltage transformers and deflection coils. It's a simple ring tester, testing the winding based on the number of damped oscillations it can make with a resonant capacitor. An internal short will turn a high Q factor transformer or inductor into a very low Q one, resulting in way less damped oscillations (rings). The Q factor is affected by the internal short turns way more than the inductance is. This tester can also ring test capacitors to estimate their dissipation factor. The previous episode: https://youtu.be/QBbEYYWiBI8 The tester and program on my website: http://danyk.cz/avr_ring2_en.html Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

How to make your own SMD to DIP adapter to get an SMD chip package into a through-hole (THT) prototyping board or breadboard. This time for SOT23-5, but this DIY trick also works for SOT23-6, SO8, SOIC8, SOP8... Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside an insect zapper from Lidl supermarket. It contains a 4W T5 UV fluorescent tube and it says it draws 4.7W in total. The schematic, how does it work, some measurements, oscilloscope waveforms, tests, dodgy experiments and dangerous modifications. The other zapper: https://youtu.be/rTLVPhAAMKo Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Finishing my small linear bench power supply with an adjustable current limit. The voltage regulation uses LM317, the current limiter uses an OpAmp (MC33171) for better accuracy. Its output voltage can be adjusted from 1.25V to 5.5V and the current from 0 to 200mA. I build it mostly to test logic circuits and microcontrollers, but also circuits sensitive to interference. Using an iron mains transformer and a linear regulator, this PSU produces no switching noise. The transformer was BVEI3048013, later I replaced it using a bit more powerful BVEI3068016. Showing the process of designing it, building it, the full schematic and how does it work. The previous episode: https://youtu.be/1kIv1s98PBE The power supply on my website: https://danyk.cz/minizdroj_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's design a small linear bench power supply with an adjustable (or fixed 5V) output voltage and a current limit. Some calculations, choosing the transformer, drawing the schematic and how does it work, some tests. The next episode: https://youtu.be/6_8iSDkFqeM Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing and restoring a soviet radio - Sokol 308 from about 1980, with MW, SW and OIRT FM bands. Explaining how a superheterodyne receiver (superhet) works, local oscillator, mixer, IF frequency, 10.7 MHz filters, ratio detector FM demodulator, AFC, AM detector, AVC / AGC, mirror image frequency reception. Diagnosing the failure, testing electrolytic capacitors, germanium transistors... Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/ The repair of my car: https://youtu.be/TbDbxvttxbg

Talking about electrolytic capacitors and their failure modes, their impedance - equivalent series resistance (ESR) and equivalent series inductance (ESL), comparing them to other types of capacitors (tantalum, film, ceramic). Showing how to use ESR meters (capacitor testers), how do they work and what's inside. Including the schematic of a simple DIY capacitor ESR meter I've built 20 years ago: https://danyk.cz/esr_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Analyzing a faulty Apple 10W USB charger. Showing what's inside, finding the faulty component, fixing the charger, showing some oscilloscope waveforms and testing various components (capacitors, a diode, transistor, inductor, resistor...). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Comparing two component tester kits based on ATmega328P and showing how they identify and test various components. For fun, I also assemble the box that comes with one of them. The tester with a color display draws 30mA and the monochrome one draws 13mA in use. Both draw less than 0.1uA in standby. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing the donated transistor tester (smart component tester) based on Atmel AVR ATmega328P microcontroller. It can auto-detect and test semiconductors - bipolar transistors (NPN, PNP), MOSFETs, thyristors (SCRs), triacs, diodes and double diodes including Schottky, LEDs and two-color LEDs, Zener diodes below 5V and even IGBT transistors with gate threshold voltage below 5V. It also tests and measures passive components - resistors, potentiometers, inductors (inductance and DC resistance), capacitors (capacitance, ESR, Vloss), and maybe more. It also has some extra functions like a voltmeter, frequency meter, signal generator and PWM generator. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring the mysterious internals of analog power factor meters and explaining how do they work. They measure the power factor of linear loads (resistive, inductive or capacitive). The power factor is the cosine of the angle between the voltage and current. It's 1 when the angle is 0 degrees (the current is in phase with the voltage). Wattmeters: https://youtu.be/SVP3on0oHHs Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a small electricity meter (energy meter, kilowatt-hour meter) that fits on a DIN rail. Finding out it's faulty and fixing it. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring the inside of a UPS (uninterruptible power supply) and explaining how does it work. This one is Back-UPS CS 350 from APC, probably 350VA and peak 500VA. It's a simple type with an iron transformer and a modified sine wave output. It converts 12V from a sealed lead acid battery to mains voltage during power outages to back up the load, usually a computer. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and disassembling a questionable 12W LED lamp made of parts originally intended for a compact fluorescent lamp. Reading its entertaining description on its box. Reverse engineering the schematic, how does it work and some oscilloscope measurements. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Showing my DIY LCD digital clock with a thermometer and date. You can build it too. It runs on batteries for years and it has a big LCD display. The schematic and the program is on my website. The date works with leap years and it has automatic summer time. The clock can be very accurate because the speed can be digitally adjusted from -99 ppm to +99 ppm in 1 ppm steps. The clock on my website: https://danyk.cz/avr_lcd_tephod_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Exploring the mysterious internals of analog wattmeters, explaining their purpose, how to use them and how do they work. What's a real AC power in Watts, apparent power in VA, reactive power (inductive and capacitive), power factor and current phase shift. Briefly talking about digital wattmeters and showing my DIY "digital" wattmeter, with schematic and how does it work. Power factor meters: https://youtu.be/8WUJgbqElOc Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

How to build a simple digital alarm clock with an LED display and a lot of useful functions. It has an alarm which can time out, a stopwatch, a countdown (kitchen timer), it shows the date and day of the week, it works with leap years and summer time (daylight saving time) and the speed can be digitally corrected from -120 to +120 ppm in 1ppm steps to make it very accurate. It runs on 5V and it uses ATmega16A Atmel AVR. The clock on my website: https://danyk.cz/avr_hod3_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a better USB charger - Alza power double charger Q200C / Qualcomm quick charge 3.0 with one USB and one USB C port. I'm examining the internals, partially reverse engineering the schematic and explaining how does it work. Including the autopsy of the switching transformer, oscilloscope measurements and explaining a flyback switching power supply with a synchronous rectifier. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Repairing and examining a soviet digital alarm clock Elektronika (Электроника) 6.15 from 1982 with a vacuum fluorescent display (VFD) IVL1-7/5 (ИВЛ1-7/5). The schematic and how does it work. Old version with K176IE12 (К176ИЕ12), K176IE13 (К176ИЕ13), K176ID2 (К176ИД2) and two K161KN1 (К161КН1) chips. Comparing it to the newer version with K176IE18 (К176ИЕ18), K176IE13 (К176ИЕ13) and K176ID3 (К176ИД3). Attempted VFD display regeneration. Possible modification for nixie tubes using K561TM3 (К561ТМ3) and K155ID1 (К155ИД1) chips instead of K176ID3. Correction: K561TM3 contains 4 latches, not 6. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Another pair of USB chargers - a test and what's inside. One is a "5-8V 1000mA" single port charger from eBay, the other has two USB ports and one micro USB port on a cable, claiming 5V 2.1A, donated by a viewer. Let's see what surprises and hazards are hidden inside. Including the schematic. Some chargers may not comply with safety regulations, they may cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can cause electromagnetic interference or damage your devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Fixing a vintage analog CRT storage oscilloscope - Tektronix 314 made in 1976. In the process, I'm exploring what's inside, how does it work and I'm trying to understand its schematic. A teardown and repair - problem in the blanking amplifier. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Reviewing a HM70R headlamp made by Fenix. Measuring its current draw in its 8 modes and calculating the maximum power. It uses a 21700 sized Li-ion battery (a bit bigger than 18650) which says 5000mAh 3.6V 18Wh (type ARB-L21-5000). I measured the real capacity and energy using my battery analyzer. I also measured the second battery (ARB-L21-5000U) which can be purchased separately and has a USB-C charging port built into it. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

How to build your own "Dubai Lamp" - an LED lamp that runs LEDs at a reduced current (lower power) to improve the efficiency and prolong its life. This was my first attempt to make LED lamps more efficient. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

A teardown of a cheap insect zapper from a supermarket. The type is LJ3W-010 (or LJ-3W010), made by Calter, imported by Rulyt. It uses an ultraviolet fluorescent tube, it runs on 220V AC 50Hz mains and it claims 3W power input, 600V zapper grid voltage. Let's see what's inside and how does it work, including the schematic and tube autopsy. Is this zapper any good? Is it safe? Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Disassembling the switching transformer of the 12V 2A flyback power supply from the previous episode. How it's constructed and isolated? Is it safe? Is there a risk of electric shock? The previous episode: https://youtu.be/fUJVDK1ovPU Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Repairing a 12V 2A flyback switching power supply, what's inside, analyzing it, reverse engineering the schematic, explaining how does it work and showing some waveforms on my oscilloscope. The next episode - the transformer autopsy: https://youtu.be/lngyl-0J-zk Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's test a cheap high voltage oscilloscope probe from eBay, marked P4250, let's do some experiments and explain how does it work. It has a 100:1 division ratio (also called 100x or x100), 2kV voltage rating, 100MΩ input impedance and 250MHz bandwidth. There's also a P4100 version with 100MHz bandwidth. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Opening another pair of USB chargers. One is a real Samsung charger, the other is a very cheap fake charger from eBay. Let's see what surprises and hazards are hidden inside. Including the schematic. Some chargers may not comply with safety regulations, they may cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can cause electromagnetic interference or damage your devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside an RGBW (red, green, blue and white) LED flashlight from eBay. This torch has 4 modes and it can produce light of 4 different colors. It runs on one 18650 Li-Ion battery (3.7V) or three AAA batteries (NiMH or alkaline). Including the schematic, how does it work, how much current does each mode draw and some oscilloscope waveforms. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Harvesting, exploring and powering a laser module with a powerful blue laser diode from an LED matrix + laser based car headlight (probably for a Range Rover). WARNING: this laser module is extremely dangerous, it can cut or burn things and it could cause a severe eyesight damage. The teardown of the headlight: https://youtu.be/JZ6REQ4Wma4 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a car headlight with an LED pixel matrix and remote phosphors pumped by laser beams from powerful blue laser diodes. The LEDs and laser diodes are made by Osram. These Smartrix headlights are probably used in Range Rover and Range Rover Sport. Powering the laser: https://youtu.be/2-zPgkk8PLM Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Some additional information on items tested in my previous videos, the creature, some viewer questions from the comments answered... Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and analyzing a red and a yellow LED lamp: Lumi E27 Red Night Flicker Free Sleep (zero blue and green light) and Day Time Yellow Flicker Free SummerGlo (no blue spike) made by BLUblox. Their purpose is to produce light that doesn't disturb your sleep, circadian rhythms or biological clock and doesn't cause eye strain. Both are 7W 85-265V AC and they claim "Low EMF". Observing their spectrum, opening them, reverse engineering the schematic, explaining how does it work and showing some oscilloscope waveforms. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a 12V 600mA 7.2VA flyback switching power supply (SMPS), including its full schematic, how does it work and oscilloscope waveforms. This power supply came with this 4x AA/AAA NiMH/NiCd charger: https://youtu.be/dqX5Wjf6VhQ Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing and opening this odd charger from Kaufland supermarket. It can charge 2 or 4 cells, NiMH or NiCd, AA or AAA. It can run on AC mains voltage or 12V DC. Including a partial schematic and oscilloscope waveforms. Correction: the package says it can charge AA with capacity over 700mAh and AAA over 400mAh. The charging currents are 700mA for AA and 350mA for AAA. The power supply: https://youtu.be/GICw2HpsInU Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Opening another pair of dangerous USB phone chargers from eBay. Let's see what surprises and hazards are hidden inside. Including the schematic and oscilloscope waveform of one of them. Some chargers may not comply with safety regulations, they may cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can damage your devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's explore what's inside an 8W filament LED lamp made by Livarno Lux. Including the schematic, how does it work and some oscilloscope waveforms to see if it produces flicker or if it's flickerless. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Just a stupid experiment to test the 4K resolution of my camera. Don't try this at home. And also my cat in 4K :). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's see what's inside this Logitech speaker set (2.1) and how does it work. Including some fake tweeters, my new angle grinder, oscilloscope waveforms, experiments and probably catching the trendy creature. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Further exploring the 175W Xbox 360 switching power supply from the previous episode. It's a frequency modulated LLC resonant power supply with a MOSFET half-bridge driven by IRS2153D chip. I explain the reverse engineered schematic, I show a lot of waveforms on my OWON SDS1102 oscilloscope and I have to face some problems with its probes. The previous episode: https://youtu.be/eUaBHeJjd4s Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Showing what's inside Xbox 360 switching power supply (power brick) and explaining how does it work. This one has 12V and 5V outputs with 175W total power. The next episode: https://youtu.be/RsTQdThpQIA Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, a quick look at Christmas tree lights with 50 tungsten lamps. And of course, happy new year to all of my viewers ;) Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

It's Christmas, so let's analyze some Christmas lights with 10 balls :). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Examining two pieces of dangerous fake cube shaped USB phone chargers. Let's test them and see what's inside, plus a high voltage insulation test. Some chargers may not comply with safety regulations and they may cause an electric shock or fire. Their current rating may be fake, the output voltage may be wrong and they can damage your devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's see what's inside a "Power 200" stun gun that claims 200 000V. How does it work, including its reverse engineered schematic. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's test a cheap zoomable LED headlamp from eBay. It has a built-in rechargeable Li-Ion battery. Let's see what's inside and how does it work. Well, this one actually doesn't work :). Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside an 8.5W LED lamp made by Osram and how does it work. Including the schematic, oscilloscope measurements and possible modifications. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Testing, opening and improving a Crivit LED flashlight from Lidl supermarket. This one runs on two AA batteries and comes with a red, green and blue filter. It says the power is 5W, but actually about half of it. It has 3 modes - high, low and SOS. I modified it by adding a resistor parallel to its capacitor, so it always goes into the high mode when turned on, yet you can still access the other modes by turning it briefly off. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

A video for beginners - how to fix a broken USB cable or any other damaged, cut or torn low voltage cable. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Let's see what's inside a headlight from Škoda Fabia 3 made in 2015. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a genuine Lenovo USB phone charger and how does it differ from cheap fake dangerous chargers. A teardown to explore the safety and quality factor, including the autopsy of the transformer. How much effort did they do to prevent an electric shock? Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

There's never enough of dodgy USB phone chargers. Let test another 2 pieces and let's see what's inside. Some questionable chargers may not comply with safety regulations and they may cause an electric shock or fire. Their current rating may be fake and they can damage your devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Playing with an old spooky traction lift with relay controls, 2-speed leveling and no inner doors. And of course, proper tungsten lamps, no LEDs :). It opens to 2 sides and serves 4 floors. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Let's explore what's inside an ultrasonic air humidifier and how does it work. This is a posh one with a fancy control panel, a timer, humidistat and an air ioniser. It splits the water into a mist using an ultrasonic transducer and it ionises the air using a negative high voltage. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Let's see what's inside an LED 3rd brake light from a car and how did it fail. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

I finally managed to fix this vintage soviet TV set - Yunost R603 (Юность Р603) from 1981. I replaced some faulty paper capacitors that changed their capacitance very significantly. I tried to replace the germanium horizontal output transistor using a modern one, but it didn't work, so I used a new old stock one. Then I explain how does the horizontal synchronization and the horizontal output circuitry work, including the S-correction capacitor and the linearity coil with permanent magnets. I generate a test television signal and modulate it using a simple 1-transistor modulator. I show some oscilloscope waveforms. Episode 1: https://youtu.be/bsfdU1-Ph34 Episode 2: https://youtu.be/j7HBFzNzBHI My DIY Atmel oscilloscope: http://danyk.cz/avr_osc_en.html My DIY TV modulator/transmitter: http://danyk.cz/tvvys_en.html Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Shorted transformer hard to tell? Let's build a tester of transformers and inductors. It can identify shorted windings, including just 1 short turn. It's hard to test switching transformers and inductors for internal shorts using any other tool. This tool is very useful, especially when fixing switching power supplies and inverters. It's a simple ring tester, testing the winding based on the number of damped oscillations it can make. An internal short will turn a high Q factor transformer or inductor into a very low Q one, resulting in way less damped oscillations (rings). The Q factor is affected by the internal short turns way more than the inductance is. The next episode (in-circuit test capable version): https://youtu.be/E1dopmxph2A The tester and program on my website: https://danyk.cz/avr_ring_en.html Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

The restoration of the vintage soviet TV set Yunost R603 (Юность Р603) from 1981 continues. I replace some dried out electrolytic capacitors in the horizontal oscillator and leaking ones in the power supply. I diagnose the linear voltage regulator with discrete germanium transistors and I explain how does it work. I explore and test the internals of the high voltage multiplier with selenium diodes. I explain the horizontal output and high voltage generation circuitry. I test some problematic paper capacitors in it and I discover the most likely cause of the shorted horizontal output transistor. Episode 1: https://youtu.be/bsfdU1-Ph34 Episode 3: https://youtu.be/A956PsZOPbc Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, let's try to fix and restore a vintage soviet TV set Yunost R603 (Юность Р603) from 1981. It's a small portable solid state black & white analog CRT television. During the process, let's also see what's inside and how does it work. Episode 2: https://youtu.be/j7HBFzNzBHI Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, the autopsy of the important components of the 24V 41.7A 1000W switching power supply from eBay. I opened the primary smoothing capacitors, which are apparently fake Nippon Chemi-Con, actually, used relabelled capacitors desoldered from e-waste (scrapped electronics). I also opened and reverse engineered the main power transformer and the GDT (gate drive transformer). I measured the winding inductances, checked the insulation safety, counted the numbers of turns and measured the wire diameters. I checked the capacitances and ESR (impedance) of all electrolytic capacitors. I also checked whether the transformers, the output inductor and the EMI inductor use copper or just copper coated aluminium (CCA). I also reverse engineered the gate drive circuitry of the power MOSFETs, quite a questionable design. The first episode - what's inside: https://youtu.be/mxl7ymOSvho The previous episode - test & measurements: https://youtu.be/NltsnPR--RI My DIY inductance meter: http://danyk.cz/lmetr_en.html Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

A teardown of an IKEA Stenkol NiMH charger for 4 AA or AAA rechargeable batteries. What's inside and how does it work. Some measurements, oscilloscope waveforms and experiments. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Testing the powerful Chinese 24V 41.7A 1000W switching power supply module from eBay. Can it really supply the rated power without failure? Doing some voltage, current and temperature measurements, showing some oscilloscope waveforms. The next episode - autopsy (transformer, GDT, capacitors): https://youtu.be/62EmUhxRWFc The first episode - what's inside: https://youtu.be/mxl7ymOSvho Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

A teardown of a powerful Chinese 24V 41.7A 1000W switching power supply module from eBay. What surprises might me hiding inside? The next episode - test & measurements: https://youtu.be/NltsnPR--RI Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Showing the schematic of the 12V 50A 600W 2-switch forward switching power supply module and explaining how does it work. Previous episode - oscilloscope waveforms: https://youtu.be/tQRxEywlhyU First episode - the teardown of this power supply: https://youtu.be/DzM3-bnotgQ Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's explore the internals of a donated CAT excavator - a remote controlled toy. Let's also find out what failed in it and let's try to fix it. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Some improvements to my sensitive DIY metal detector with a Double D (DD, 2D) balanced coil (about 15 cm / 6 inch diameter). Now it detects a small aluminium coin (18 mm diameter) at 35 cm distance and a small iron can at 70 - 80 cm distance. It has an audible indicator. Its pitch tells the signal strength. I'm moving it from a breadboard to a prototyping circuit board. It runs roughly at 11 - 12 kHz. Using a resonant capacitor with a lower dissipation factor (tan delta) in the transmitter reduced the power consumption. I also tried to fine balance the detector coils using potentiometers instead of physically moving them. The first episode: https://youtu.be/eCRgNr6jj2g Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's try to build a sensitive metal detector with a Double D (DD, 2D) balanced coil. Can I build my own metal detector capable of finding metal objects buried deep in the ground? My first, very makeshift breadboard prototype uses an induction balance DD coil with about 15 cm (6 inch) overall diameter. It detects a small aluminium coin (18 mm diameter) at 22 cm distance and a small iron can at about 45 cm distance. Correction: the transformer primary (44t) is 0.39 mH, not 0.39 uH. The next episode: https://youtu.be/-czOV-hKSlA Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's build a simple metal detector using a donated DIY metal detector kit. It detects metal objects as they reduce the feedback in a simple oscillator. The detection coil is integrated into the PCB board and it's a part of a single transistor oscillator. Metals will reduce the coupling, leading to an amplitude drop, which is detected using another two transistors and indicated by a buzzer and an LED. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's take a look at a USB mosquito killer, called "inhahed mosquito killer" on its box. On other sides of the box, it's called "suction type mosquito killer" and "mosquito killer lamp". It's made by Photocatalysis. Type: KLY-188. It runs on 5V DC from a USB port. It says it draws 5W, but actually just 0.9W. It contains a brushless DC fan and 6 UV LEDs. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Even more experiments with my German AC mains voltage regulator from 1965. The input is 220V 50Hz +10 / -20%, the output is +/- 1% accurate 160V / 200V / 220V 50Hz, 300VA continuously, 350VA peak. I do some oscilloscope measurements of the waveforms and I try to reduce the harmonic distortion of the output voltage. I also explain various versions of ferroresonant voltage regulators. I talk about the isolated and non-isolated versions, compensated and neutralized versions and also about its single core version - a constant voltage transformer (CVT). The previous episode: https://youtu.be/wlbIquRRJZA Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's see what's inside a 1960's AC mains voltage regulator. This box has to contain alien technology, as it's able to regulate a wide range of input voltages into a +/- 1% accurate 220V 50Hz output voltage using no transistors or semiconductors, no vacuum tubes, no moving parts and if fact just 3 components! Including its weird schematic and how does it work. The next episode: https://youtu.be/tQKOoZyz3a4 Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Yet another collection of 2 dodgy quick QC3.0 USB phone chargers from eBay, probably fake Qualcomm. Some questionable chargers may not comply with safety regulations and they may cause an electric shock or fire. Their current rating may be fake and they can damage your devices. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

More experiments with the induction cooker. Waveforms on my oscilloscope, figuring out how does it work. It seems to be a series resonant circuit driven above its resonant frequency by an IGBT halfbridge. It uses zero voltage switching (ZVS). The transistors turn on at zero voltage, with no turn-on loss. They turn off under a current, but the turn-off loss is minimized using snubber capacitors. The output power is frequency modulated. Lower frequency gets is closer to resonance, resulting in more power. The previous episode: https://youtu.be/bx8YXvfNtOI The first episode: https://youtu.be/Z9ryVMdqndU Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today I try to power the donated induction cooker plate. I do some experiments, test and measurements. I show various waveforms on my oscilloscope and analyze how does the circuit work. The next episode: https://youtu.be/xIAo-JCNYf0 The first episode: https://youtu.be/Z9ryVMdqndU Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's see what's inside a magnifier lamp (a magnifying glass with a built-in illumination). This one contains a circular fluorescent tube with an electronic inverter. I reverse engineer the full schematic of it and explain how does it work. It faulty, so I try to fix it. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's take a look what's inside an induction cooker plate and how does it work. I explore the internals of a cooker with 5 induction coils donated by a viewer. I also reverse engineer the schematic of the power section. The next episode: https://youtu.be/bx8YXvfNtOI Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Building a DIY spot welder from a Microwave Oven Transformer (MOT) - 3rd episode. In this episode I optimize the low voltage secondary from 4 turns to 3 turns, but a thicker wire. This helps to deliver more power into the spot weld. The 4-turn secondary wasn't properly matched to the typical resistance (impedance) of a spot weld (iron sheets). I also remove the magnetic shunts from the MOT, which increases the peak current capability by at least 10%. I build a proper mechanism to align the electrodes and I do some measurements and test spot welds. In the next episode, even more improvements are coming. The previous episode: https://youtu.be/NaZnVINIR8A The 1st episode: https://youtu.be/uoSChZxZuAs Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

Today, let's see what's inside the protection box of the donated Utrai 12V 2500A peak car jumpstarter. Previous episode: https://youtu.be/dK3ERyM1mNU Please support me on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

One more collection of 2 dodgy quick QC3.0 USB phone chargers from eBay. Some of these cheap chargers may not comply with safety regulations, they may cause an electric shock or fire and their current rating may be fake. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, let's examine a donated 12V 2500A peak car jumpstarter made by Utrai. It has a 88.8 Wh Li-Ion battery. It also works as an LED torch and a power bank with 2 USB outputs, one supports QC 3.0 quick charging (5V 3A, 9V 2A and 12V 1.5A). It even has a 10W wireless charging pad. It can be recharged using a 5V 3A USB-C port. It has an LED display indicating its state of charge and modes of operation. Let's unbox it, see what's inside and how does it work. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Another collection of dodgy USB phone chargers from eBay. This time a quick charger edition. Three cheap USB chargers that support 18W QC3.0 charging and they can supply 5V 3A, 9V 2A or 12V 1.5A. Some of those cheap chargers may not comply with safety regulations and they may cause an electric shock or fire. They also tend to have a non-existent interference suppression, poor output voltage regulation and a fake current rating. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild

Building a DIY spot welder from a Microwave Oven Transformer (MOT) - 2nd episode. In this episode I wind the low voltage high current secondary using some scrap CRT degaussing coils and I try to do some spot welds. Then I do some measurements and calculations and I discover that my spot welder could be optimized. In the next episode I will do some improvements and test it again. The next episode: https://youtu.be/c8GlyKGhjO4 The 1st episode: https://youtu.be/uoSChZxZuAs Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Let's build a spot welder from a Microwave Oven Transformer (MOT). In this episode I talk about MOTs, do some tests and experiments, I remove the high voltage secondary winding from a big MOT and I prepare it for a low voltage high current secondary. In the next episode I will wind the secondary and try to use it as a DIY spot welder. The next episode: https://youtu.be/NaZnVINIR8A Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I test one more "Electricity saving box", also called "Intelligent energy saver" or "Power factor saver". It comes from eBay for about 4 USD including shipping. Let's see what's inside this scam device. Let's also do some measurements and calculations. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Showing various waveforms in the 12V 50A 600W switching power supply module on an analog and a digital oscilloscope. It's a 2 switch forward. The waveform on the main ferrite transformer, gate driving transformer (GDT), output inductor (on an iron powder core), MOSFET gates, primary smoothing capacitor ripple, output ripple, mains input current, changes in duty cycle, transistor current and so on. Next episode - schematic & how does it work: https://youtu.be/8K73TBtIIs0 Previous episode - (re)winding the transformer: https://youtu.be/WblalRdECGY First episode - the teardown of this power supply: https://youtu.be/DzM3-bnotgQ Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/

What's inside a Xiaomi Mi Electric Scooter Pro, some fun and experiments, like a "dyno test" :), regenerative braking test and changing its settings via bluetooth. This one has a 10S4P Li-Ion battery pack, 37V 12800mAh 474Wh. The board is from Pro 2. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild

Another collection of dodgy USB phone chargers from eBay that may cause an electric shock or fire. They also tend to have a poor interference suppression, poor output voltage regulation and a fake current rating. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Unboxing, teardown and a thorough capacity test of the 20 000 mAh powerbank from Lidl supermarket made by Silver Crest. Let's see what's inside and measure if the Li-Ion (Li-Pol) battery in it really is 20 000 mAh. I'm also testing my new camera (Panasonic Lumix DMC-LX15) and my new USB tester for the first time. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Cleaning the fan and heatpipe in my 5 years old laptop. It was full of dust, restricting the air flow. The fan was always spinning very fast and loud, but not much air was blowing to cool the heat exchanger on the heat pipe. Now it works much better. A noisy blower fan is one of the easiest laptop problems to fix, and it also prevents the CPU from overheating. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's analyze a weird failure of a 10W LED lamp, show what's inside, fix it and also reverse engineer the schematic and explain how does it work. Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, let's see if the 500A peak jumpstarter power bank from Lidl (UMAP 12000 A2) can start a 2 liter diesel engine in Škoda Octavia 2.0 TDI with a totally flat battery in winter after standing for several cold weeks in about -10°C. The unboxing and teardown of this jumpstarter: https://youtu.be/3T8x6b1PDyw Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's rewind the faulty transformer of my 12V 50A 600W switching power supply. I wound it partially the original way (with some original shortcomings), just using copper instead of aluminium, and splitting the secondary into more parallel wires, leaving the original design of the primary. Of course it could be redesigned much better, fitting higher cross section of copper into it to reduce the current density. It could also use many more of thinner wires to further reduce the skin effect. The returns that waste space could be eliminated by winding each section in two layers. The secondary could be a copper strip which is more space-efficient for high current low voltage windings. Next episode - oscilloscope waveforms https://youtu.be/tQRxEywlhyU Previous episode - failure analysis & transformer autopsy: https://youtu.be/SXWV3JBNDl8 First episode - the teardown of this power supply: https://youtu.be/DzM3-bnotgQ Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, let's analyze what failed in the cheap dodgy 12V 50A 600W switching power supply module from eBay from China. It stopped working after 1 hour and 7 minutes at full 50A load. Let's find out what components are faulty and let's see what's inside the switching transformer. Next episode - rewinding the transformer https://youtu.be/WblalRdECGY Previous episode - the test of this power supply: https://youtu.be/tzoVcU9Bg_Y First episode - the teardown of this power supply: https://youtu.be/DzM3-bnotgQ Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, let's test the cheap dodgy 12V 50A 600W switching power supply module from eBay from China (also monitoring the temperature). I tested it at 5A, 10A, 20A, 36A and finally full 50A load. The result probably wasn't a surprise :). I also talk about thermal resistances of transistors, diodes, heatsink pads and heatsinks. I explain how steeply the power dissipation of some components may grow with the current. Next episode - failure analysis & transformer autopsy: https://youtu.be/SXWV3JBNDl8 Previous episode - what's inside of this power supply: https://youtu.be/DzM3-bnotgQ Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today let's make a teardown of a cheap 12V 50A 600W switching power supply module from eBay from China. A nice design, but some hidden surprises like fake or recycled components, and power transistors poorly mounted on the heatsink. Next episode - the test of this power supply: https://youtu.be/tzoVcU9Bg_Y Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

A quick look what's inside a 14.4V cordless drill battery pack somebody threw away. It turned out to contain 12 NiCd cells in series, 1.2V 1200mAh each, giving 14.4V 1200mAh in total. It's probably an older one, the newer ones contain Li-Ion cells. I'm testing some of the NiCd cells trying to reuse them in a small 2.4V or 4.8V drill. Update: I analyzed 9 cells at 1C discharge after 1C charge, all were over 1300mAh, more than the rated capacity! Warning: NiCd batteries contain toxic cadmium. They must be handled and disposed properly. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

What's inside a 12V cordless power drill / screwdriver. Including the schematic of the motor speed regulator (controller) and an autopsy of the gearbox with its adjustable torque mechanism. It probably had a 3-cell Li-Ion or a 10-cell NiCd battery. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I try to fix an ATX computer power supply that was accidentally switched to 115V and plugged into 230V mains (with some sparks, smell and tripped circuit breaker). Which components are damaged? Is it possible to repair it? Let's see. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's fix a broken 1986 soldering gun and let's see what's inside an even older one, probably from the 1960s or 1970s. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I show how to fix a switch mode power supply (SMPS). In this case it was a 750W ATX computer power supply (a 2-switch forward topology with an active PFC). I demonstrate how to find faulty components. I mostly focused on testing semiconductors (transistors and diodes). As a bonus, I show some waveforms on my oscilloscope and demonstrate the operation of the 3.3V and 5V regulation with saturable inductors (at 24:42). Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look what's inside an electronic EGR valve used in 1.6 TDI and 2.0 TDI turbocharged diesel engines in Škoda, Volkswagen, Seat and Audi cars. This one comes from 2012 Škoda Octavia 1.6 TDI 77kW CAYC. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's fix a rechargeable LED-illuminated magnifying glass. It has 6 LEDs in it and a USB port to recharge it. It was faulty, but I managed to fix it a very simple way. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I test the capacity of the 12000mAh car jumpstarter powerbank from Lidl. I explain the difference between mAh / Ah and mWh / Wh battery rating and what happens to the charge and capacity when you put cells in series and parallel. I also check how the cells are balanced in this power bank. Unboxing and teardown of this power bank: https://youtu.be/3T8x6b1PDyw Starting a 2 liter diesel: https://youtu.be/V73dShdKZjo Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's compare the cheap RED 1000 mAh rechargeable 1.2V AAA NiMH batteries from Lidl with the more expensive GREEN 950 mAh ones that boast of being precharged, eco-friendly and having a low self-discharge. Is there any reason to pay more for the green ones? Testing the red AA & AAA from Lidl: https://youtu.be/e084X3aTpd0 Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, I tried to fix a 20V 6.75A 135W laptop switching power supply with an active PFC. This time it didn't go well. But at least, you can see what's inside. I explain how does an active PFC (Power Factor Correction) and a synchronously rectified flyback work. I also show how to test a MOSFET, diodes and a bridge rectifier. I show a simplified schematic and locate the important components on the board. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Please support me on Patreon: https://www.patreon.com/DiodeGoneWild Today, let's take a look at a 12V 500A car jumpstarter from Lidl supermarket. It's a 12 000 mAh (at 3.2 V) USB power bank with a jump starter that can start your car when its lead acid battery is dead. It contains a Lithium Iron Phosphate (LiFePO4) 4-cell battery (3000 mAh 12.8 V). Let's unbox it and see what's inside and how does it work. Measuring the capacity: https://youtu.be/1ReIoRDi5cA Starting a 2 liter diesel: https://youtu.be/V73dShdKZjo My Instagram: https://www.instagram.com/savage_danyk/

Today, let's test some cheap rechargeable batteries from Lidl supermarket. They are NiMH, 2500 mAh AA and 1000 mAh AAA made by Tronic, 2.60 USD per pack of 4, that's just 65 cents a piece. RED vs. GREEN AAA comparison: https://youtu.be/QKsmpf8f4Cg Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

One horrible unedited video about dumb and intelligent NiCd and NiMH battery chargers. The waveforms of the charging current are weird and unexpected for some! Please support this channel on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild

In this video I analyze the schematic of a flyback switching power supply and explain how does it work. This one is a 5V 10A 50W SMPS with a bipolar transistor, not a MOSFET, and no control chip. I also show some waveforms on my oscilloscope. How I repaired this power supply: https://youtu.be/VGM-VBN_7Zo Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild

Please support this channel on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild The schematic and how does it work: https://youtu.be/9fmpLUUtvow Today, let's see how to fix a faulty 5V 10A 50W switching power supply (SMPS). It produces strange sounds and the output voltage is unstable. I show all the important components on the circuit board. I identify and replace components that failed. I talk about the impedance (ESR) of electrolytic capacitors. I also improved the heatsink mounts of the power transistor and diode.

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild Today, let's test some cheap LED headlamps from eBay, compare them with a more expensive branded one, see what's inside and how do they work, reverse engineer the schematic and also try to modify and improve them.

Today, let's see how a digital pocket scale is calibrated using a calibration weight. My 500g max / 0.01g resolution scale requires a 500g calibration weight for its calibration. The calibration process is entered by a long press and then a short press of the UNITS button, it briefly displays CAL and then blinking 500.00g, then the calibration weight is put on the scale, then it displays PASS and it's calibrated. What's inside this scale & how does it work: https://youtu.be/Iyh6ZCYQnX0 Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild Today, let's open a cheap digital pocket scale to see what's inside and how does it work. This one goes up to 500g with 0.01g resolution. It seems to contain a load cell with 4 strain gauges set up in a Wheatstone bridge configuration.

Today, let's measure the real capacity of "TESLA" and "Switch on" AA alkaline batteries. Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild My DIY battery analyzer: http://danyk.cz/avr_aku_en.html

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild Today, let's take a look what's inside a Compact Fluorescent Lamp (CFL). I also reverse engineer the schematic and explain how does it work, I talk about possible failures and how to fix them, and I show some waveforms on my oscilloscope.

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild A quick unedited video - what's inside a cassette tape recorder made in USSR in the 1970's. This type was called "VESNA", which means "SPRING". I mean springtime, the season, despite there's a lot of springs in it too :). Probably Vesna 305 or Vesna 306 model. Unfortunately, the condition of this one is too poor for a restoration.

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild Today, let's take a look what's inside a digital socket timer. Let's also reverse engineer the schematic of its power board. This timer was faulty, but it came back to life after recharging the backup battery. Sometimes you have to replace the battery to repair it. Other common failures are the relay, the Zener diode, which gets very hot, and the electrolytic capacitor.

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild Today, let's test a giant laser donated by a viewer. It looks very powerful and dangerous. Let's also see what's inside and how does it work.

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild I designed my Solid State Tesla Coil (SSTC) for 1 half-cycle of 230V AC 50Hz mains, but today, let's try to botch it onto 60V DC from my 2400W DIY bench power supply: http://danyk.cz/reg60v_en.html

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild The rest of the stun gun: https://youtu.be/q40otB2Ht60 Today, let's see what's inside a high voltage module of a stun gun. Let's reverse engineer its schematic and explain how does it work. The module was in some kind of epoxy resin, so I had to test various ways to remove the resin.

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild Today, let's see what's inside a mechanical socket timer and how does it work. This is a 24 hour plug-in mains timer. I show how to modify it to a one-time timer (turns the load off after a specified time and never back on). I also explain how does its synchronous motor work (including some slow-motion).

Yet another CRT television teardown. Let's see what's inside a once posh Sony Trinitron from 1995. I also salvage the circuit boards with useful components and copper coils from it before disposing it. Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild WARNING: Televisions contain dangerous mains voltage and a very high voltage for the CRT tube. Capacitors and the CRT tube can remain charged to a dangerous voltage even after the TV is disconnected from the mains. Risk of electric shock. Risk of fire. The CRT tube is under vacuum, risk of implosion and injury from flying glass fragments. Electrical appliances must be disposed properly. Do NOT open, repair, modify or build any appliances unless you are qualified for it. Do NOT attempt to do what you see in this video. This video is NOT an instruction. You do everything at your own risk and responsibility.

Today, let's see what's inside another CRT television. This one is from 1997, made by Orava OTF. Let's salvage the circuit boards with useful components and copper wire from it before scrapping it. Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild WARNING: Televisions contain dangerous mains voltage and a very high voltage for the CRT tube. Capacitors and the CRT tube can remain charged to a dangerous voltage even after the TV is disconnected from the mains. Risk of electric shock. Risk of fire. The CRT tube is under vacuum, risk of implosion and injury from flying glass fragments. Electrical appliances must be disposed properly. Do NOT open, repair, modify or build any appliances unless you are qualified for it. Do NOT attempt to do what you see in this video. This video is NOT an instruction. You do everything at your own risk and responsibility.

Today, let's take a look inside an old CRT television from 1998 and salvage some useful components and copper wire from it before scrapping it. Support this channel on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild WARNING: Televisions contain dangerous mains voltage and a very high voltage for the CRT tube. Capacitors and the CRT tube can remain charged to a dangerous voltage even after the TV is disconnected from the mains. Risk of electric shock. Risk of fire. The CRT tube is under vacuum, risk of implosion and injury from flying glass fragments. Electrical appliances must be disposed properly. Do NOT open, repair, modify or build any appliances unless you are qualified for it. Do NOT attempt to do what you see in this video. This video is NOT an instruction. You do everything at your own risk and responsibility.

Today, let's test even more of radioactive "negative ion" Chinese items from Ebay using my Geiger counters. A Negative ion pendant, a rubber bracelet and a metal bracelet. They're supposed to have magic healing superpowers, but they are just random things and some of them contain radioactive thorium dioxide or other radioactive material. Warning: These products could be harmful. This video shows just my personal opinion, I could be wrong. My DIY Geiger counters: http://danyk.cz/gm_ind_en.html http://danyk.cz/avr_gm_en.html Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Support me on Patreon and get early videos: https://www.patreon.com/DiodeGoneWild The next part - what's inside the module in resin: https://youtu.be/tWvTUFOvWwE Today, let's take a look inside a small cheap dodgy Chinese stun gun. It's a WS-618 type self-defensive flashlight. I've partially drawn the schematic of it. The rest of the schematic inside of the high voltage module in a resin will hopefully be reverse engineered in the second part.

Today, let's take a look inside a big server switching power supply with an active power factor correction (PFC). The output is 56V, unknown current and power, but probably several kW. It probably used to charge a 48V lead acid backup battery and powered several DC/DC converters probably to 12V and 5V. As always, a "quick" unedited video that went horribly long, but at least not horribly wrong :). Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at some cheap fake chips I've bought from Ebay. They are IR2153 and IR21531 mislabeled as IR21531D, and on top of it, some of them are not working. They just take some faulty chips, used chips or different type of chips, sandpaper them and print a new marking on them. Let's test them and see how to spot them. Update: I got a full refund from the seller. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's make a teardown of an LED torch with a built in insect zapper from Lidl. The schematic is completely crazy. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at a nice 12V 2A switch mode power supply (SMPS) module. I identify its components, test it and show some waveforms on my oscilloscope. Then I draw the schematic and explain in detail how does it work. I also analyse its safety, disassemble the power transformer and count the numbers of turns. I talk about possible failures. I also show how the output voltage could be modified and how to turn it into an adjustable voltage power supply. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today I warn about the risk of accidental x-ray production when using a Tesla Coil. Vacuum tubes, vacuum tungsten lamps, discharge lamps with an outer bulb under a vacuum, or other vacuum / very low pressure vessels may produce x-ray radiation when exposed to a high voltage from a Tesla coil. I also diverge to DIY x-ray machines with x-ray tubes powered using various high voltage multipliers, usually from old CRT televisions. Those dodgy homemade contraptions are commonly used with an amplifying screen from an analog x-ray cassette, used as a fluoroscopic screen. Such experiments are very dangerous and I don't recommend them. The first episode: https://youtu.be/kjWkpG52-o4 Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild My DIY x-ray from 2009: http://danyk.cz/rtg7_en.html http://danyk.cz/rtg8_en.html Kreosan's DIY x-ray: https://youtu.be/hiYkSnm29b8 https://youtu.be/fwl1JNoFdhg Sifun's x-ray (gave his fingers radiation burns!): https://youtu.be/hx7sQ8OvIiY

Today, let's do some random experiments with my Tesla Coil (a solid state one). Let's play with discharges to a grounded electrode and let's remotely power some gas filled tubes. A Tesla coil can wirelessly transfer energy to various fluorescent tubes, neon lamps, discharge lamps and even LEDs. Let's also try to color the sparks using salt that contains sodium. WARNING: These experiments are very dangerous. Risk of electric shock. Risk of fire. Risk of burns. Items with vacuum or a very low pressure in them may produce harmful x-ray radiation when exposed to a high voltage. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/QuRdLf8UkJI Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

What's inside a switching 12V / 230V 50Hz 1000W DC / AC inverter with a modified sine wave output. A "quick" unedited teardown video. Notes: On the parallel pair of 150uF 400V capacitors I measured 267V. That's also the peak output voltage. The ten parallel input capacitors are 2200uF 25V. Warning: Despite being powered from a safe battery voltage, the output voltage and the internal voltages of such inverter can be dangerous. Capacitors may remain charged even after disconnecting the inverter from the battery. Risk of electric shock. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today it's another test of my Solid State Tesla Coil. Now the primary is just 3 turns and the sparks are longer. Still the same IGBT halfbridge driven by IR2153 with discrete gate current amplifiers. Some oscilloscope waveforms - output voltage of the halfbridge. One halfcycle operation from 230V 50Hz mains. Power consumption about 1000 - 1100 W. I plan to test IR21531 or IR21531D with a shorter internal deadtime. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/cvhSAVE-nEM Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's talk about ways to minimize the stray inductances (and resistances) of the MOSFET / IGBT gate drivers and other parts of a Solid State Tesla Coil. This may also apply to any switching power supply, inverter, induction heater, and so on. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/-41XLZInuqQ Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's finally see some sparks! The first test of my Solid State Tesla Coil with a temporary secondary. I also did some oscilloscope measurements of the halfbridge output voltage waveforms and solved the problem with the overheating resistors in the snubber networks. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/2m1mIzGq_2o Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's test the IGBT halfbridge of my Solid State Tesla Coil using mains voltage and an inductive load. Let's also do some random experiments with induction heating and wireless energy transfer. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/DRaLqP-aYrw Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's improve the gate driving circuitry of my Solid State Tesla Coil. Instead of driving the IGBT gates directly by IR2153 outputs, I now use current amplifying transistors. I decided for discrete gate current amplifiers over gate driving chips like TC4421 or TC4422, because I prefer common, easily available components. I used pairs of NPN+PNP bipolar transistors connected as emitter followers. They speed up the rise and fall time about 5x. The rise time improved from 200ns to 40ns and the fall time from 100ns to 20ns. I used BD139 + BD140 old school transistors from my old stock, but I may try some better ones in the future. The IGBT transistors in my halfbridge are AOK60B65H2AL, but I plan to replace them with faster DGTD65T60S2PT. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/9qOjeURI2lE Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today it's restoration time. Let's restore a vintage 1982 Czechoslovak Eta iron and also see how does it work and what's inside. It's rated 220V 1200W, the heater is 42 ohms, and it has a 1.5V 0.2A tungsten lamp indicator in it, powered using a shunt. And of course a bimetal thermostat, and that's it, there's nothing else in it. Unedited video, except pausing the phone camera. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, some theory of snubber networks and a halfbridge Solid State Tesla Coil controlled by IR2153 chip, but most of it applies to any half bridge or full bridge (H-bridge) SSTC or any other switching device like switching power supplies or inverters, induction heaters or welding inverters. What destroys the MOSFETs or IGBT transistors. Do your transistors keep blowing? Design it properly and burn no more silicon :). The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/qVz0C0vvZjc Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's do some experiments with RC snubber networks in my Solid State Tesla Coil. Let's test the IGBT halfbridge using an inductive load and do some oscilloscope measurements. The snubber networks limit the voltage overshoots on the transistors and the dV/dt, so the transistors don't fail. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/a6R3OmYmyBk Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's see what's a reverse transfer capacitance of IGBT and MOSFET transistors and the Miller effect. Let's do some more oscilloscope measurements in my Solid State Tesla Coil. I use a halfbridge of IGBT transistors (AOK60B65H2AL) driven by IR2153 chip via 15 ohm resistors. Let's see how the Miller capacitance affects the gate waveforms. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/02zPXGxyObI Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's do some oscilloscope measurements in my Solid State Tesla Coil. Let's see how the IR2153 halfbridge driver chip drives the gates of IGBT transistors (AOK60B65H2AL). Let's guesstimate the rise and fall time from the waveforms. In the next episode, I will improve the gate driver circuitry to minimize the rise and fall time (drive the gates faster). The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/w1PUG_8AsOc Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's make the circuit board for my halfbridge Solid State Tesla Coil. It's of course a very crude but quick DIY dremel prototyping board. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/Wn3RP-KqMjI Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's test more of Radioactive Chinese products from Ebay using my Geiger counters. A Scalar Energy Nano Wand Pen and Negative ion shoe pads. They're supposed to have magic healing superpowers, but actually they just contain radioactive thorium dioxide. Warning: These products may be dangerous. This video shows just my personal opinion, I could be wrong. My DIY Geiger counters: http://danyk.cz/gm_ind_en.html http://danyk.cz/avr_gm_en.html Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's design a simple schematic of a halfbridge Solid State Tesla Coil (SSTC). For simplicity, I use IR2153, a self oscillating MOSFET / IGBT halfbridge driver with floating upper gate output. I power it using a resistive dropper. And of course I use RC snubber networks to protect the transistors! The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/sxGBNpce3wY Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's compare and choose suitable fast IGBT transistors for my Solid State Tesla Coil and let's also briefly explain how to read their datasheets (PDF). The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/iap-HcjxliA Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's choose what type of transistors to use for a Solid State Tesla Coil. I explain the differences between the most common power transistor types. I quickly ruled out BJT (bipolar junction NPN) transistors. Then I have to decide between MOSFETs and IGBTs. Both have their advantages and disadvantages. MOSFETs are generally better for smaller Tesla coils, IGBTs for bigger ones. The first episode: https://youtu.be/kjWkpG52-o4 The next episode: https://youtu.be/hGQsfOeYhuc Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's start another Tesla coil series, this time a Solid State Tesla Coil (SSTC) series. I explain what is a SSTC and a DRSSTC (Double Resonant SSTC) and how it differs from a Spark Gap Tesla Coil (SGTC). The next episode: https://youtu.be/dRxBfXlIWiA Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

This is the sixth episode of my Spark Gap Tesla Coil series. I put it all together and test it for the first time. Some success, some accident, and most importantly, some new knowledge gained. The first episode: https://youtu.be/wSp1IzmRUk8 Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's make a quick unedited teardown of a serious switching power supply, probably for some server or high performance computer. It supplies 12.25V / 175A and 56V / 10A. That's about 2.7kW total output power. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

This is the fifth episode of my Spark Gap Tesla Coil series. I show how to make an adjustable multi-gap static spark gap using copper pipes. The first episode: https://youtu.be/wSp1IzmRUk8 The next episode: https://youtu.be/l42LxZhop2E Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

This is the fourth episode of my Spark Gap Tesla Coil series. I show how to calculate and build the secondary coil and how to measure its resonant frequency. The first episode: https://youtu.be/wSp1IzmRUk8 The next episode: https://youtu.be/hfEde2j-8yY Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

This is the third episode of my Spark Gap Tesla Coil series. I talk about various types of homemade capacitors for a SGTC and I decide to use a Multi Mini Capacitor (MMC). With the help of my cat, I build a big MMC and I describe its design and the calculations. The first episode: https://youtu.be/wSp1IzmRUk8 The next episode: https://youtu.be/J36W7maz9SU Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at (and into) a Tetris brick game that gives electric shocks! It's not a real Tetris brick game, but a questionable Chinese prank gadget with a high voltage transformer connected to the buttons. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's repair a broken Soviet Elektronika 2 (Электроника 2) digital alarm clock with a VFD display made in 1983. Unedited video recorded using just the pause function of my phone. In those clocks, the electrolytic capacitors often fail open circuit, resulting in buzzing noise and flickering display. The VFD display may wear out over time or get damaged by dropping the clock. Also the Soviet 32 768 Hz crystals often fail or get very inaccurate. Occasionally the soviet chips K176IE18 (К176ИЕ18), K176IE13 (К176ИЕ13) or K176ID3 (К176ИД3) fail or the display develops internal short circuits. The display is IVL1-7/5 (ИВЛ1-7/5) and it can be replaced by a similar ILC4-5/7L (ИЛЦ4-5/7Л). I also tend to adjust the 5V~ heater voltage using a series resistor if it's higher than it should be. Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

This is the second episode of my Spark Gap Tesla Coil series. I talk about various high voltage transformers and power supplies, current limitation, series and parallel connection, inductors and magnetic shunts. I show how to make a high voltage power supply for a Tesla coil using microwave oven transformers (MOTs). With a schematic. Warning: extremely dangerous high voltage. Risk of serious electric shock! The first episode: https://youtu.be/wSp1IzmRUk8 The next episode: https://youtu.be/X7fos5ErRsg Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's start a series about how to build a Spark Gap Tesla Coil (SGTC). In this episode I explain the theory - how does it work. The next episodes will focus on each component and how to choose or build them. The next episode: https://youtu.be/zo1TYNwWjJo Please support this channel on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's create some giant high voltage discharges using 8 Microwave oven transformers (MOTs) and a lot of 1uF 2100V capacitors. I managed to draw arcs longer than me :). Warning: this experiment is extremely dangerous, don't try this at home. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's see what's inside my DSO FNIRSI PRO handheld digital oscilloscope (5 MHz, 20 MSps). It was meant to be a short peek inside, but I ended up making a review, identifying all important components in it and also fixing the AC-only mode that for some reason didn't work. Please support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today it's stupid experiment time. Let's try to run a dangerous Chinese 220V~ electrode water heater at 400V~. And of course, even more salt :). Don't this at home or anywhere else... You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's compare a good quality safe USB charger with a dangerous charger and an even more dangerous charger :). Let's see what's inside, including schematics and how do they work. Only use good phone chargers, don't get electrocuted. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Another questionable product: Negative ion scalar pendant, Japanese technology, quantum energy ion balance, scalar energy, with miraculous superpowers, heals and improves everything, made by BioEnergy international. What it actually is: A piece of unknown slightly RADIOACTIVE material that you're supposed to wear on your body. Maybe thorium dioxide. It's hard to tell exactly how dangerous this is, but it definitely doesn't have any benefits. The video from The Thought Emporium: https://youtu.be/C7TwBUxxIC0 You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's see what's inside a switching charger for a supposedly 36V 9000mAh Li-ion powered drill / screwdriver. This charger was donated by Voltlog. I review the charger, he reviews the drill and battery packs in his video: https://youtu.be/kvTozkYbRoI You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's test and open another powerbank with the help of my cat. This time it's a 10 000 mAh rated powerbank made by "mm" with two USB ports (1A and 2.1A). Is the capacity and current capability is real or fake? What battery and circuitry does it contain? Let's see. Note: the clamp meter measurement may have been influenced by a transformer or inductor in the nearby charger SMPS. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Another hotel room teardown (quick unedited video)

Today, let's take a look at two different types of LEDs rated directly for AC mains voltage. It comes in 110V version (also runs on 100V / 115V / 120V) and 220V version (also runs on 230V / 240V). No power supply or LED driver is needed. Let's test them, compare the efficiency with the best mains voltage LED I've found so far and of course let's also reverse engineer the schematic with the help of my cat :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at a very strange schematic of a 5V USB charger switching power supply. It contains a Poweric PI751 chip and it has no optocoupler, no auxiliary winding, high side switching, floating GND pin of the chip and voltage sensing connected to the primary winding! It's apparently a 1A design (the voltage plummets at about 1.1A), but they marked it as 2A. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today lets take a look at (and into) a scary Russian (or Soviet) electric device. Let's figure out its purpose and how does it work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's test another 6 cheap USB phone chargers. Let's see what's inside and how safe (or dangerous) they are. Some of them with schematic. Low quality or fake chargers may be quite dangerous. They can cause a fire or an electric shock and electrocution death. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Just a random unplanned URBEX video - taking a peek into a very old spooky factory with an old lift, dodgy wiring, a lot of cats and World War II bullet holes in the wall.

Today, let's take a look at SAFE-808 COM, a 2 in 1 combined detector of combustible gasses (like methane, propane, butane, natural gas, CNG, LPG, ...) and toxic carbon monoxide (CO). It has an alarm to warn you in case of a gas leak or CO leak. It can help to prevent an explosion or gas poisoning (suffocation). Let's "properly" test this detector and also see what's inside and how does it work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Happy new year to all of my viewers! My girlfriend's grandma giving lunch to her ten cats on Christmas :).

Today, let's test a donated brake fluid tester. It tests a brake fluid for water content. Glycol based brake fluid is hygroscopic and thus it deteriorates by absorbing moisture. This tester indicates the water content in the brake fluid using 5 LEDs (0 - 4%). Let's test it, check its accuracy and see what's inside. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's restore a vintage analog multimeter AVOMET from 1950's. It was produced in Czechoslovakia by Metra and it measures AC and DC voltage and current. The website with the 1956 magazine scan: http://sroll.net/ok1srd/technika/avomet.htm You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

WARNING: Do NOT open any gas appliances unless you are qualified for it. Risk of fire, explosion, burns, gas poisoning, carbon monoxide poisoning, suffocation, electric shock, etc. You do everything on your own risk and responsibility. I'm not responsible for any injuries, deaths or property damages caused by you. This video is NOT an instruction! Besides cleaning the other parts of a gas burner from dust, it's also a good idea to clean the ingition electrodes and most importantly the flame sensor electrode (ionising electode). The flame sensor senses the presence of the flame probably based on the conductivity of the flame and if no flame is detected, the gas is shut down. It will also keep shutting down if the elctrode is dirty or oxidized. I cleaned it using a sand paper and then I cleaned the electrode from the remains of the sand paper (fine glass dust) using a tissue.

Today, let's see how to remove security tags from clothes or other items in case they accidentally left them on in the shop. Let's also see how do they work. They are called security tags, ink tags, electronic article surveillance (EAS), anti theft tags or inventory control tags and they are used to stop people from shoplifting (stealing stings from shops). They are supposed to be removed by the cashier, but occasionally they forget to do it and then you have to remove them yourself. There are numerous techniques, some of them include brute force and may cause injury or damage the item, but the easiest way is of course using a strong neodymium magnet. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I take a look inside a vintage analog multimeter. It's AVOMET made in Czechoslovakia. It measures AC and DC current and voltage. I also tried to restore it, but it didn't go very well because of its condition. I managed to fix it just partially. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I'm looking for components for my big Spark Gap Tesla Coil (SGTC) and talking about them. Capacitor bank, also called a Multi Mini Capacitor (MMC), Microwave oven transformers (MOTs), primary and secondary winding, current limiting inductors and a top-load. I also show some old, dodgy or interesting things, like my Marx generator, my old DIY x-ray machine and analog x-ray cassettes with amplifying screens, a book from 1886, some soviet CRTs and clocks, Zenit cameras, a mercury blood pressure meter, dodgy wall socket above a bathtub, dodgy DIY fluorescent fixtures, antique thermometers, a cheap Chinese stun gun... At the end of the video I wanted to say that I've lost a spark gap I've made for a tesla coil, but as always, I ran out of memory :). My old Spark Gap Tesla Coil: http://danyk.cz/tesla5_en.html My DIY x-ray machine and pictures: http://danyk.cz/rtg7_en.html http://danyk.cz/rtg8_en.html My vintage thermometers: http://danyk.cz/reaumur_en.html My vintage digital clocks: http://danyk.cz/stare_digi_hodiny_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at a small LED flashlight that runs on one 1.5V AA battery. It's marking is "Skywolfeye B18". For its size, it's really quite powerful and bright. It's zoomable and it has 3 modes (high, low, strobe). Let's reverse engineer its schematic and explain how does it work. Let's also try to get rid of the annoying flashing mode and modify it for just 1 mode (high power). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Another quick undedited video. Trying to run a multi-stage mains voltage LED on a variable AC voltage from my variac. Also showing my vintage mechanical clocks, weather stations, thermometers and a mercury barometer, a DIY LED digital clock, thermometer and a weather station, boxes of capacitors for my spark gap tesla coil, nixie frequency counter, vintage soviet camera and Elektronika LCD games, very dodgy DIY fluorescent fixture, DIY vacuum tube oscilloscope, very dodgy old homemade fly zapper and a soviet VFD clock. Some of those things are documented on my website: http://danyk.cz/index_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

As some of my viewers suggested, I tried to put an ionising smoke detector (35kBq Am241) next to my alpha sensitive Geiger counter (with mica window Geiger tube). Warning - ionising smoke detectors contain a radioactive source and they can be dangerous. I also show my nixie clock made of TESLA components and a nixie clock made of soviet components I'm just building. This nixie clock has a similar schematic as soviet Elektronika clocks with K176IE18, K176IE13 and K176ID3 chips and IVL1-7/5 or ILC4-5/7L VFD display, but the 7-segment driver K176ID3 is replaced by K561TM3 (4x latch) and K155ID1 (a nixie driver). I also show my vintage Christmas lights with tungsten lamps (originally 12x 20V 100mA, now modified to 11x 24V 50mA lamps). And the gas heater now works well :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

My gas heater keeps shutting down. It's clogged with dust and it has to be cleaned. My cat helps me a lot with this task :). As usual, my quick unedited video ends when my phone runs out of memory. Don't do this unless you are qualified for this! Risk of gas leakage, suffocation, gas poisoning, explosion, burns, electric shock and a lot of other dangers.

Today let's make an autopsy of a 2.45 GHz cavity magnetron from a microwave oven. Let's see what's inside and how does it work. Let's also see if its cathode is radioactive. My video about a microwave oven: https://youtu.be/BNW7FnEKa7Y You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today, let's take a look inside a microwave oven. Let's see how does it work and how to repair it. I show all the components of a microwave oven, explain its schematic and talk about its most common failures. Magnetron autopsy: https://youtu.be/42UF_kED34Q You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Peeking into a mysterious room next to an elevator on ground floor. Is this a machinery room of a hydraulic lift? They left the keys in the door lock! I couldn't see much. This small room probably leads to another room, but I didn't have balls to progress any further. I don't know what does the sign on the door say.

Examining more electrical things and window mechanisms in my italian hotel room with a beautiful view of mountains, nature and mercury vapor street lamps :) And of course, I said 1.33 A/mm2, but I meant 13.33 A/mm2 current density. (10A / 0.75mm2 = 13.33 A/mm2)

We went abroad to run a race. As usual, I'm making a teardown of my hotel room. You can guess the country based on the electric mains sockets :).

Today, let's take a look at another mains voltage COB LEDs. This time they are 50W and 10W versions with 3528 (or 2835?) SMD LEDs on an aluminium substrate. They're not typical Chip On Board (COB) LEDs, those are "SMD package on board" :). The 10W version is a 4-stage LED with a 3000B current regulating chip. The 50W version is just single stage, with five JZ1008AE current regulating chips and a bit lower efficiency. With a schematic of both. My video about the 30W LED: https://youtu.be/u24iOGOaCMU You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's take a closer look at a very interesting component. A synchronous rectification diode DK5V45R20 (marked 45R20). It's a synchronous rectification device that contains a MOSFET transistor and an integrated control circuitry in a 2-terminal package that looks like an ordinary diode. I initially didn't realize what I'm looking at. I found it inside of this night light with a USB charger: https://youtu.be/qpACaRAI6yE You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at a night light from Lidl supermarket. It's called just a night light, but it also has two 5V USB ports that can supply up to 2400mA (2.4A) in total. The night light can be switched on, off or to automatic (light sensor). The mysterious 45R20 diode later turned out to be something completely unexpected! Let's see in another video... You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today let's take a look at a tiny but powerful 30W driverless COB LED. It runs on 220V / 230V / 240V ac mains voltage with no LED driver needed. Its size is only 19x19mm (3/4 x 3/4 inch). Can such a tiny LED really handle 30W? How efficient is it compared to other LEDs? You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's test another mains voltage COB LED. This time it's a 90x75mm 220V 30W LED with 64x 3528 (or 2835?) SMD LEDs on it. It comes from Ebay for 3 USD including shipping (later I found another seller that sells it for 2.40 USD). It has three 3000B current regulating chips. It has about double the luminous efficiency of the previously tested mains LEDs! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's examine some USB chargers. Most of them are generic (read: fake). Such chargers may be quite dodgy. They can cause a fire or an electric shock and electrocution death. But there are also some good ones. I've accumulated a lot of those chargers, so I decided to put multiple of them in one video. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

A short compilation of construction fails and other interesting oddities I've recently found and documented. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today let's find out how does my solar USB charger and its inverter work. It's Choetech SC004 5V 2.1A which was donated to me. The previous video about this solar charger: https://youtu.be/lVUEnlqFMvc Where to buy it: https://bit.ly/2ZnkiXp $ 31.99, discount code: FSPCWH 20% off code for all of their items: SAVE20WH You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's test some mains voltage LEDs. Those are called integrated driver LEDs or smart COB (chip on board) LEDs and they are designed to be connected directly to AC mains voltage. They come in 110V or 220V version, cool white or warm white version, and many power ratings (10W, 20W, 30W, 50W, 70W, 100W, 150W, 200W). Let's reverse engineer their internal schematic, let's try to build a powerful LED light with them and also try some modifications. My previous video about a mains LED: https://youtu.be/PklaByEQSZA You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A quick video about dodgy electric contraptions being assembled at the beer festival in my city. And of course, one of my proper videos is being edited right now and it will be uploaded in a day or two...

Few more electric things from my hotel in Italy. I explore the hallway. I keep calling their circuit breaker a switch because it looks like a switch to me. Czech circuit breakers look different and they are behind a small door, not exposed. I have no idea what's the mysterious circle with green light. And I criticise the "posh" fridge.

Another experimental quick unedited video from my travel. What do you think about this format? Some more wiring and hotel room oddities.

I'm trying to upload just a quick video from my travel. No editing. I use just the pause function of my phone and upload it directly. No computer. I show the odd Italian plugs and sockets, a hotel hair drier and a main switch that turns everything off in the room (including the hair drier my girlfriend was just using :)). And also a hotel phone and a halogen light dimmer retrofitted with an LED and also a tiny LED lamps next to the beds. The centre hole of the Italian sockets is the ground.

Today let's take a look at a USB foldable solar charger made by Choetech. It was donated to me, thank you :). It's a model SC004, rated 5V, 2.1A. Let's test it! https://bit.ly/2ZnkiXp $ 31.99 discount code: FSPCWH 20% off code for all of their items: SAVE20WH The next video about this charger: https://youtu.be/jGShG-gpdGo You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's take a look at a 3-mode "20 000 lm" zoomable LED flashlight that comes with a fake 18650 Li-ion battery and a deadly charger (risk of electric shock and fire). Includes schematic and transformer autopsy. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's take a look at a 5V 2A switching power supply module. Let's test it, draw its schematic, explain how does it work, find its problems and fix them. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Riding some Swedish lifts with the famous KLÄMRISK warning signs. Sadly, those do have inner doors despite those warnings. I'm not sure what's the point of those warnings then. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's investigate another 3 good looking, but still relatively cheap 3.7V 18650 Li-Ion rechargeable batteries from Ebay. They are rated 2500mAh, 3000mAh and 3400mAh. What's the actual capacity? You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at and inside of a 10000mAh power bank (Vanguard-X1) made by Ainope, which was donated to me. It has 2 USB outputs (2.1A and 1A) and 2 different charging inputs. It also has a nice LED display indicating the state of charge. It contains a Li-Pol battery pack rated 10 000 mAh. Let's test it and see how does it work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I tried to repair a big 850W ATX computer power supply. It had quite a lot of faulty components, so instead of fixing it, I decided to reverse engineer some schematics, explain how does it work and do some experiments on it. It didn't go horribly wrong, just horribly long :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I tested another cheap rechargeable 18650 Li-Ion battery from Ebay. It has a blue heatshrink on it, a flat top and 2000mAh rated capacity. I've measured the capacity of it, weighed and examined it. Is this a fake battery, a recycled (rewrapped) battery from e-waste (used electronics), a cheap low quality production or a rejected defective battery? You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Let's design a buck regulator a bit better than the Chinese makers do (including schematic). Let's also talk about calculations of resistors in parallel and about the problem of a high impedance (ESR, ESL) of electrolytic capacitors. The previous video about the charger: https://youtu.be/D4RqBEBt7MY You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I thoroughly test and examine a cheap two in one 5V USB charger with a 100-240Vac mains input and a 12-24Vdc car input. I take a look inside, reverse engineer its schematic and explain how does it work. Then I try to do a lot of modifications to the circuit. Surprisingly, this doesn't go horribly wrong, just horribly long :). Even more improvements of the buck regulator: https://youtu.be/RLS9pD_QjHU You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at a cheap charger for 18650 Li-Ion cells. It's powered from a USB port, not mains, so it should be safe... or shouldn't it? Watch this video! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild The list of 18650 Li-Ion cells I've tested. Note how many of them say PROTECTED despite having no protection: http://danyk.cz/test18650_en.html My Instagram: https://www.instagram.com/savage_danyk/

Today, let's take a look at a powerful Skywolfeye "90 000 lm" 5-mode zoomable LED flashlight from Ebay that runs on two rechargeable 18650 Li-Ion cells. Let's test it, do some measurements, open it, reverse engineer it, explain how does it work and see how well it's designed. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's take a look at another dodgy USB charger. This time it's a cube with 2 USB ports, rated 2.1A (for iPad) and 1.0A (for other devices). The switching power supply is supposed to be 5V 3100mA, but this is far from reality. Also the safety of it is quite questionable. It may cause a fire or an electric shock. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's see how to repair a power tool charger with a faulty switching power supply. Let's learn how to test a power NPN / PNP transistor, MOSFET, diode, electrolytic capacitor and so on... My DIY ESR meter (with schematic): http://danyk.cz/esr_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I calculate and manually rewind the faulty coil in my vintage vibrating reed frequency meter. The same way you can wind any coil of an electromagnet, inductor, relay or a winding for a transformer. You can also repair appliances or machines by rewinding their faulty windings. The enameled copper wire can even be taken from other scrapped appliances for free. Sources of a free copper wire: https://youtu.be/DLxQb0oK6Cc My vintage reed frequency meter: https://youtu.be/xJGsVrs9El8 You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's see where to get a free enameled copper wire for a DIY transformer, electromagnet, inductor, tesla coil secondary or to repair electronics and machines by rewinding their windings. Of course you can buy the wire, but it's also possible to get it for free from scrapped or faulty electronics. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today, let's have fun with yet another collection of dodgy Chinese toys that give people electric shocks as a questionable kind of prank. Let's also take a look inside, see how does it work, reverse engineer the schematic and do some measurements using my multimeter and oscilloscopes. All of those electric shock gadgets are very cheap on Ebay, about 1 - 3 USD. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I fix a broken metal strainer using my old DIY spot welder. I have built this spot welder a very long time ago using a winding and cores from scrapped 1970's or 1980's discharge lamp ballasts. Today I'd definitely build it rewinding a microwave oven transformer (MOT), but microwave ovens were not around back then when I was building this dodgy spot welder. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I explain in detail how does a half-bridge switching power supply work. I use my 24V 10A 240W SMPS for demonstration, but most AT and ATX computer power supplies and many other high-powered power supplies work the same way. The first part: https://youtu.be/KIilQrgJ-gg You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I took a look at a cheap 24V 10A 240W switching power supply module from Ebay. Let's test it, let's see what's inside, let's find its fault and let's repair and improve it :). The next part (detailed explanation of the schematic): https://youtu.be/wNnOfF1NkxI You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today let's take a look at a vintage 1962 soviet era vibrating reed frequency meter. It's an analog frequency meter based on multiple metal strips (reeds). Each of them has a slightly different mechanical resonant frequency. It also contains a coil connected to an AC current. The reed with a resonant frequency very close to the frequency of the current in the coil will vibrate. This will indicate the frequency on the scale. Those devices have a narrow range of measured frequencies. They are mostly used to measure the frequency of a 50Hz, 60Hz or 400Hz mains. Rewinding the faulty coil of this frequency meter: https://youtu.be/rGwUl7cwhMA You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I show some interesting old electronic parts I came across. This is what electronic devices were made of in the past. Let's take a trip into the old good days with me :). I show some old vacuum tubes, dekatrons, nixie tubes, relays, glass crystals, panel meters, neon lamps, lift switches, metal transistors, Geiger counter tubes, xenon lamps, VFD displays, CRT's and other electronic components of yesterday. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I tested a powerful 20W zoomable Cree LED flashlight from Lidl supermarket. It has 4 modes and it runs on nine AA alkaline batteries. It has just a single big LED instead of multiple small LEDs. This allows for the zoom function. Let's see what's inside :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video you will see a safety test and an autopsy of a cheap portable electric water heater element (immersion boiler) from Ebay. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Visiting grandma in her old house and documenting its dodgy wiring, construction fails and of course, grandma's seven cats :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I tested another 2 dirt cheap 18650 size Li-ion cells from Ebay, donated to me by a viewer (thanks!!!). This test includes capacity measurement using my DIY battery analyzer and, of course, an autopsy. Can those super cheap batteries be real, or just another fakes? List of all 18650 Li-ion cells I've tested: http://danyk.cz/test18650_en.html My DIY battery analyzer: http://danyk.cz/avr_aku_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today let's take a look at my homemade inverter welder. It's a bit unfinished and dodgy, but it works well :). Just like my questionable DIY welding mask. The schematic of my welding inverter: http://danyk.cz/svar_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today let's take a look inside a "smart home" smart socket made by TAURON in Poland. It's a mains socket with a remote control function, power monitoring and a thermometer. It pairs with a mobile application using wi-fi. Let's take a look at its insanely overcomplicated internals and reverse engineer its unusual switching power supply. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Real or fake? Is it possible to build a powerful EMP cannon using a magnetron from a microwave oven and a stun gun? Let's try to recreate it and debunk Kreosan's insane video. Can his crazy machine really destroy electronics and light up fluorescent lamps at 10m? The original video: https://youtu.be/0XbLz0L6UdI You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I made a high voltage test and overcurrent test of the 3 USD multimeter from my previous video. This video includes some smoke and explosion :). I also talked about the dangerous probes of this multimeter. The previous video about this multimeter: https://youtu.be/R693vS09hoo You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I explore an original old elevator made in 1978 by Transporta. It's an innerdoorless swing door lift with relay logic, classic 2 speed levelling using a high-slip 2-speed asynchronous AC motor, and a simple memory (remembers just one button). It serves 4 floors (basement, ground, 1 and 2) in a hospital. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I test a cheap multimeter from Ebay for 3 USD including shipping (DT830B knock-off). Does this thing work? Is it safe to use? What's inside? Let's see in this video :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I'm testing the cheapest tyre pressure meters from Ebay from China. Are they any good? Can they accurately measure the pressure in your car tyre? How do they work and what's inside? Let's see :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is totally off-topic, but I just had to upload it for fun :). I was urban exploring an old scary 1970's hospital. I found creepy service tunnels in the basement, cold war nuclear shelter, old (relay logic) lift with no inner doors, a derelict escalator, vintage speaker system, x-ray machines, biochemical lab with biohazard signs and a room full of old abandoned medical equipment. I almost got caught :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a review, teardown and modification of the new powerful Skywolfeye zoomable 3 mode "6000 lm" Cree LED Flashlight from Ebay for just $ 1.99 including shipping. It runs on a standard 18650 Li-Ion cell (not included). It only worked with a button top battery, but after my mod, it works with a flat top too. The listing claims an "XM-L XPE" LED and 6000 lumens, but the actual light output won't be more than 400 lumens. This is still very good for a $2 1x18650 flashlight (or actually the best you can get for such price and in such a small size). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I took a look inside a hair dryer, curler, styler, dresser, hot air brush or whatever it's called. I reverse engineered its schematic, explained how does it work and revealed its design flaws. I also found its common failures and fixed it. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I take a look inside a mechanical digital alarm clock (flip clock) UDW1 made by Bosch probably in 1970's and I explain how does it work. It runs on two C batteries. It has a buzzer with an electromagnet and contacts. It contains a mechanical spring-driven clock movement with an escapement, but it's wound by a DC motor every time the spring is running out. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is part 2 (the insane part) of my video about the (in)famous electric heated shower head, nicknamed a "suicide shower". It looks (and by the 1st world standards, it actually is) quite dangerous, but millions of people in South and Central America use it and I don't hear about too many deaths caused by it. In this part of the video I do some electric tests and measurements and I also actually try to get under it (!!!). PART 1: https://youtu.be/jo99U3nVCnA You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

This is the first part of my video about the famous electric heated shower head, nicknamed a "suicide shower", produced by Lorenzetti and other makers. It looks quite dangerous, but it's widely used in Latin America and I don't hear about too many electric shock deaths caused by it. I take a look inside, explain how does it work and do some calculations regarding heating water up and tank-less heaters. PART 2: https://youtu.be/jiErqUkw690 You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I tested an electric insect zapper from LIDL supermarket. Its nonsensical manual calls it both a zapper and a repeller (two completely different things) and also confuses UVA light with blue light. This zapper has 4 UV LEDs, a high voltage grid and a twilight sensor. I've reverse engineered its schematic and then successfully improved it. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

After a long delay, I finally managed to make a review and teardown of FenSens - an interesting wireless parking sensor. It uses bluetooth to communicate with its quick launch button and an application in your smartphone. This app can be downloaded for free. FenSens can detect obstacles up to 3m from your car during parking. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I repair my antique Torricelli barometer (mercury stick barometer) with air bubbles (air locks) in it. I explain how does this type of barometer work and how it was invented. This device measures atmospheric pressure and gives you a weather forecast. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I show how does a coffee maker work and find out how to repair it. I also reverse engineer its schematic. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

So I managed to make a 22 minute video about a piece of wire :). Actually, I made a thorough analysis of a cheap and dangerous power extension from China for LED strings or anything else. I explain some calculations of a voltage drop on its resistance and the power dissipation. I also talk about calculating the conductivity (inverse of resistivity) of a wire. The tripping curves of circuit breakers are also explained. And of course, the video contains some stupid and dangerous experiments with a short circuit and lots of smoke :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I assemble an LED decoration kit with a questionable meaning. I solder the PCB board (including SMD components) using my soldering gun and my crazy soldering techniques. Then I reverse engineer the schematic of it, suggest some improvements, do some measurements and show the pulse width brightness modulation waveform on my oscilloscope. Those kits were donated to me by Václav. Thank you :). The website of this kit: http://party-pritelkyne.cz You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This time I took a look at (and into) a "30W" corn LED light bulb from China from Ebay for 3 USD. Can this really be 30W? Is it safe to use? I made some measurements and tests with my wattmeter, multimeter and oscilloscope. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Skip to the actual test: 3:04 Today I made an (over)load test of the dodgy power extension from the last video. Most power strips may cause a fire when overloaded, but some are risky even when loaded within their rating. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I made a teardown of a travel power extension socket with a USB charger from China with a picture of a mouse on it. It has a mains plug, a cable, mains socket and 4 USB sockets. It immediately looks quite dangerous because of a very thin mains cable and a 3-terminal mains socket, despite the mains plug is just 2-pin non-grounded. The ground (earth) terminal doesn't go anywhere. The charger can't continuously supply the claimed 4.8A current and the mains isolation is questionable. Risk of electric shock and fire. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a detailed teardown of the amazing Pirl Charger with 4 USB ports, 2.7A per port, 10.8A total. Each port is individually regulated using a DC/DC synchronous buck regulator with independent overload protection, short circuit protection and overheat protection. Each port also has a red/white LED indicator. The Pirl charger is unique for its integrated Wattmeter showing the total power consumed in Watts on an LED display with an adjustable brightness. The input voltage is 7-17V and it can work with an AC/DC mains power supply, a car adaptor, solar panels, 2S/3S/4S Li-Ion battery packs or 12V lead acid batteries. This Pirl charger with a mains and car adaptors was donated to me by Kobby from Pirl Technology: https://www.pirlcharger.com You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I tested even more of 3.7V 18650 Li-ion batteries from Ebay and explained how to tell the real ones from the fake ones. 18650 Li-ion cells that weigh under 40g tend to have a low capacity. The cells marked over 3500mAh are surely fake and actually are about 500mAh only. Cells with spelling errors also tend to be fake. Button top batteries are way more likely to be fake than the flat top ones. Suspiciously cheap cells are usually fake or recycled from e-waste (rewrapped cells salvaged from old laptops or other devices). Marks from previous spot welds may be covered using metal circles. Recycled cells may range from almost unused to totally worn out. Fake batteries may claim a protection they don't have. List of all 18650 Li-ion cells I've tested: http://danyk.cz/test18650_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I took a look at a Chinese 5V 1A USB charger with 3 USB ports. I tested the maximum current capability, took a look inside, reverse engineered the schematic of it, measured some waveforms using my oscilloscopes and finally I made an autopsy of the switching transformer. This power supply from China from Ebay turned out to be a death trap. It's dangerous because of a too narrow isolation on the board and virtually no isolation in the transformer. The USB output and thus your phone or other device may easily become live at mains voltage, leading to an electric shock. Having no fuse, it also poses a fire hazard. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I took a look inside a cheap Chinese crystal controlled wall clock movement (mechanism) and found out how does it work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I was doing just a stupid experiment with a heap of extension sockets, power strips and so on :). Don't try this at home. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I was testing some cheap rechargeable 18650 3.7V Li-Ion batteries from Ebay. They are sold in pairs and branded as "Double Pow" or "DoublePow". The measured capacity seems very close to the nominal one. They are marked ICR18650, they have a flat top and they are unprotected. They come in 2000mAh and 1200mAh versions. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I took a look at even more of Chinese electric shock toys (prank gadgets), made a teardown of them and some waveform measurements using my oscilloscope and a makeshift high voltage probe. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I make an autopsy of a GU-50 power pentode and explain how does this vacuum tube work. GU-50 is a soviet copy of LS-50. It's a linear RF amplifier designed for radio transmitters up to 120 MHz and 50 W, but it was also used in TV sets and medical equipment. Nowadays it's used by audiophiles for audio amplifiers and also for vacuum tube tesla coils (VTTC). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I took a look inside a Chinese "9W" spotlight LED lamp with a COB (chip on board) LED. This version has E27 base and runs on 220 / 230 / 240V AC mains. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This video is a teardown of a small and simple vacuum tube oscilloscope (Tesla BM370). I talk about its restoration, show its internals and explain how does it work. So let's travel back in time to the old good days and take a look at this nice vintage analog oscilloscope (including its schematic). The schematic and info about this scope: http://danyk.cz/bm370_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

How to build a DIY PowerBank with 6x 18650 Li-Ion cells using a kit. Ebay sellers call this Power Bank kit "DIY" because it comes with no batteries :). You have to put your own 18650 Li-Ion cells in it. For just $2.70 including shipping still not bad. WARNING: Li-Ion batteries and power banks can catch fire or explode! Risk of fire, injury and burns. You do everything at your own risk and responsibility. You can support my channel on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I explain how does a classic analog oscilloscope work (a scope with an electrostatic deflection CRT). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild More about this scope: http://danyk.cz/c1-118_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I talked about my Patreon account I've just created ( https://www.patreon.com/DiodeGoneWild ) and then I made a teardown of my new Voltcraft VC-330 clamp meter. It turned out to be UNI-T UT210E with just a different brand name on it and a different color! I reverse engineered the schematic of the input section of it with the protections. It seems to be a nice clamp meter, but it probably doesn't matter whether you buy Voltcraft VC-330 or UNI-T UT210E. You always get the same internals. Voltcraft VC-330 contains PCB boards marked UT210E. Previous video - the test of this clamp meter: https://youtu.be/u0vaGpLXLEg You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I was doing an unboxing, review and test of the Voltcraft VC-330 clamp meter. It's a nice small AC/DC clamp meter with a zero button, True RMS and 2000 counts (actually 2200). It has 2A, 20A and 100A AC/DC current ranges. The 2A range has a nice 1mA resolution. The voltmeter goes up to 600V. The ACV max resolution is 1mV and DCV resolution is 0.1mV. It has a HOLD button and a white backlight. It also measures resistances with 0.1 ohm max resolution and goes up to 22 Megaohms, it has diode test up to 2.2V, conductivity beep test and a very good capacitor meter. The max resolution of capacity is 1pF and it goes up to 22 mF (yes, 22 000 uF !). It also has a non-contact AC test (cable detector to find live wires in walls, etc.). This clamp meter turned out to be virtually the same as UNI-T UT210E except the color. See the teardown of it here: https://youtu.be/m7cD_W3cQlE Today I also created a Patreon account as some of my viewers suggested: https://www.patreon.com/DiodeGoneWild

Today I took a look at a very dangerous LED lamp from China. The board with the 2835 SMD LEDs has no cover and the LEDs are live at mains voltage. Live terminals exposed! It also has no fuse, poor heat sinking, no inrush resistor and the actual power is not what the listing claims. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I took a look at a very cheap Chinese 12V 1A adapter from Ebay. The listing says it is for LED strips, CCTV, routers, audio/video equipment, etc. This AC/DC adapter has 100-240V universal mains input and 12V 1A DC output. I took a look at the board layout, reverse engineered the relatively simple schematic of it and made an autopsy of the transformer. This power supply is quite dodgy - there's no fuse, no EMI filter, no inrush resistor, no snubber network and a very questionable capacitor between the primary and secondary side. The isolation distance on the board is 1.5mm. I have seen more dangerous transformers, but also much safer ones. This switching power supply claims 1A current capability, but actually is capable of only 0.5A. The cable wires are quite thin. The plastic housing is very easy to open. This adapter can pose a risk of an electric shock or fire. I personally wouldn't use it. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

This is part 3. See part 1 here: https://youtu.be/cX4q0e124C4 Part 2: https://youtu.be/mNquVjDnpxU In this video I explain the differences between a Continuous Conduction Mode (CCM) and a Discontinuous Conduction Mode (DCM) in a flyback switching power supply (SMPS). CCM and DCM modes also apply to an inductor of a non-isolated converter (buck regulator, boost regulator or a voltage inverter) and to the output inductor of a forward switching power supply or the output inductor of a half-bridge, a bridge or a push-pull. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is part 2. See part 1 here: https://youtu.be/cX4q0e124C4 Part 3: https://youtu.be/3ySlJ99OSN4 Today I made some measurements in the flyback switching power supply from the last video. I found out what are the voltages and currents in it, what is the operating frequency, the maximum load and the waveforms. In the next video I will explain a CCM (continuous conduction mode) and DCM (discontinuous conduction mode). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Part 2: https://youtu.be/mNquVjDnpxU In this video I explain in detail how does a flyback switching power supply work. I show a SMPS from a DVD player as an example, I draw a schematic of it and I explain how does it work using this example. I also explain how you could modify a switching power supply output voltage and how to turn it into an adjustable voltage power supply (DIY bench power supply). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

The schematic in my DB of reverse engineered schematics: http://danyk.cz/reverz44_en.html Today I made a teardown of an industrial switching power supply module S-120W-12 in a metal housing. The input is 100-240V AC mains and the output is 12V DC 10A 120W. It came from Ebay and it cost me only $8. In the listing it's called "switching power supply LED driver adapter", but it may have a lot of uses other than just powering LED strips. The SMPS is based on the old good UC3842 control chip, TL431 voltage reference and an 817 optocoupler. It has an open loop protection added, made of discrete transistors. It also has a softstart, a proper fuse, NTC thermistor, safety capacitors, snubber networks, EMI filters, good isolation distance and a relatively safe-looking transformer. The only problem of this switching power supply is the way the power transistor and diode are mounted on the heatsink! Just the sharp corner of it actually touches the aluminium plate! This video got quite long, but it's not easy to cover such a complex appliance in just few minutes. I didn't even get to explain why is the power supply clicking when in short circuit and why it may produce audible noise (whistling) if there was no slope compensation. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I made a teardown of a USB charger donated by one of my viewers and I reverse engineered its schematic. Then I found that the transformer in it has no isolation between the windings! This USB charger from China (fake Apple iPhone charger) has a transformer with no insulation tape between the primary and secondary side. The output of it (and thus the entire phone including its metal casing) is isolated from mains just by a super thin layer of enamel (lacquer) on the magnet wire! This means a very high risk of an electric shock and death. This dangerous electrocution device comes in various colors including white, which looks just like a real Apple iPhone charger. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I test if sound can travel in a vacuum. I put some buzzers (beepers) in my vacuum chamber and listen if I can hear them from the outside. I also tried to put a PC fan in a vacuum. This is my DIY vacuum chamber: https://youtu.be/1bJJaq3EUl8 This is my super cheap vacuum pump: https://youtu.be/_-FqKxE9ttY You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

What happens if you fill a vacuum chamber with a lot of balloons? You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I show how to build your own super cheap DIY vacuum chamber. You need just a glass jar for food canning, a lid, a piece of plastic tube, hot melt glue and some hose. Combined with a vacuum pump, this homemade vacuum chamber allows for a lot of interesting experiments. You can also add a vacuum gauge to indicate the level of vacuum. I connected the vacuum gauge using a "T" splitter from a broken blood pressure meter. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Previous video - How does a fridge compressor work: https://youtu.be/itSYUw1UeSY Today I was trying to build a DIY vacuum pump from a fridge compressor. I tried to measure the vacuum it can pull. I also tried to chain two fridge compressors (put them in series) to see if this can create a better vacuum. I reached about 80 mbar (8 kPa) vacuum with one compressor and 40 mbar (4 kPa) with 2 compressors (the discharge of one goes into the suction of the other). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Next: Fridge compressor as a vacuum pump? Measuring the vacuum: https://youtu.be/_-FqKxE9ttY In this video I explain how does a refrigerator (fridge or freezer) and its compressor work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This time a took a look at (and inside) an ultrasonic parking sensor. It looks like a traffic light and it should prevent you from hitting the wall of your garage :). It uses an ultrasonic impulse that's being reflected from your car to detect its distance. I reverse engineer its schematic and try to explain how does it work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I test another 3 electric shock prank gadgets from China. An electric shock hand grip, an electric hand buzzer and an electric shock pen. I make a teardown of them and reverse engineer the schematic. I also measure the output current and the peak voltage. WARNING: These devices may be dangerous. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I make a teardown of a 5W 12V~ LED lamp (halogen lamp replacement). I reverse engineer the schematic of it. Then I explain how does a constant current (current mode) switching power supply work. In this case, it's a buck regulator with a common positive rail. I also find out that this LED works over quite a wide range of AC and DC voltages, despite claiming only 12V AC. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

My test of AA alkaline batteries has a new winner. It is Aerocell from Lidl supermarket. The capacity came out as 1444 mAh (at 500mA discharge to 0.8V). This is the best one so far in my comparison of disposable AA alkaline cells. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Today I take a look inside a party disco light. It's simply an RGB LED lamp with a rotating disco globe (dome) on top of it. It projects moving red, green and blue beams. It has an E27 (E14) screw base, so you can install it into any ceiling light or table lamp. It runs on 230V 50Hz mains and draws about 3W. I reverse engineered the full schematic of it. The power supply was a bit different than I expected :). WARNING: Mains voltage is dangerous. Risk of electric shock and death! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

It's Christmas time, so today I take a look at vintage Zlatokov fairy lights that were quite popular in 1970's and 1980's in Czechoslovakia. I managed to repair them in this video. Being made donkey's years ago, those obviously contain classic tungsten lamps, not LEDs. I really prefer the soft incandescent light inside a big lampshade over the very sharp monochromatic colors of LEDs. I also took a look at a newer set of tungsten lamps and explained what is an antifuse. WARNING: Some types of Christmas lights are not isolated from the mains and they contain dangerous mains voltage. Risk of electric shock and death. Risk of fire. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I take a look inside a big and powerful 19W LED lamp from Lidl supermarket, made by Livarno Lux. I reverse engineer the schematic of it and explain how a buck regulator works. UPDATE: The control chip is BP2839A. The transistor is BPM5001. WARNING: This lamp contains dangerous mains voltage! Risk of electric shock and death! The power supply is a buck regulator with no mains isolation. The entire circuitry including the LEDs is live at mains voltage! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I made an autopsy of the switching transformer from the 12V 5A power supply I was testing in the last video. So let's take a look how this ferrite core SMPS transformer is constructed and how safe it is. The teardown of the 12V 5A switching power supply: https://youtu.be/Ej9ck8JoE2s You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I tested a 12V 5A 60W switching power supply that cost me only $3 including shipping from China. The listing says it's for LED strips, CCTV and LCD monitors. The actual current capability is only 3.5A and some parts are underrated. The PCB board definitely seems repurposed. It looks bodged, but I have seen much worse SMPS designs :). This one has a proper fuse, EMI filters, very good isolation distance on the PCB and safe X2, Y1 capacitors. I managed to reverse engineer a full schematic of it. I also explain in detail how does this switching power supply work. One of the viewers helped me to identify the control chip as XN1049 (thanks!). Autopsy of the switching transformer: https://youtu.be/tWG0SNYzFRI You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I tested a Chinese LED strip rated for mains voltage. It runs directly on 220 / 230 / 240V AC with no power supply. The listing says it's waterproof. This definitely raises some questions. I couldn't resist the temptation to test how waterproof it really is. This video shows a lot of dangerous experiments you should never try to do! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Most of LED strips are 12V, occasionally 24V, but this LED Strip is USB-powered and so it has to run on 5V only. It comes in 1, 2, 3, 4 and 5m lengths and in warm white, cool white, red, yellow, green and blue color. A nice LED strip, except that the resistance of the long, thin power rails is not exactly negligible :). The USB cable doesn't contain much copper either... You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I tested and reverse engineered a 24V 4A 100W switching power supply module (XK-2412-DC) for LEDs or any other purpose. It also comes in 12V 8A version. This power supply works well an seems good, but I'm able to find some flaws in any device :). I have drawn a full schematic of it and explained how does it work. It's a flyback power supply with a MOSFET, CR6841S control chip, an optocoupler and a 431 voltage reference. This switching power supply was donated to me by a kind viewer "Siana Gearz", so big thanks to you ;). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I took a look inside a cheap Chinese breath alcohol test device (breath analyzer). It contains an alcohol sensor and a simple indication circuit with 3 LEDs. The LEDs indicate 3 levels of breath alcohol content: no alcohol, 0.02% BAC and 0.05% BAC). It also has a torch function and runs on 2 AAA batteries. During this teardown I managed to reverse engineer the full schematic and explain how does it work. This device seems to work well, but you still don't have a 100% guarantee of accuracy. Even if it shows no alcohol, it does not guarantee you can drive safely. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Building a DIY Power Bank with 4x 18650 Li-Ion batteries using a kit. The sellers on Ebay call this PowerBank kit "DIY" because it comes with no cells and you have to put your own 18650 Li-Ion cells in it :). For just $1.80 including shipping, it's still not bad. I also added fuses into it for more fire safety. WARNING: Li-Ion batteries and power banks can catch fire or explode! Risk of fire, injury and burns. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Somebody told me about this and I thought it must be a joke. This can't be real... it's just another hoax. But then I tried it. It really works! No matter how crazy it sounds, you really can tell a full AA alkaline battery from an empty one just by dropping it. The full battery doesn't bounce, the empty one does bounce. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Capacity test and comparison of AA alkaline batteries. Which of those single use (non-rechargeable) batteries lasts the longest? I compared brands like Duracell, GP, Varta, Energizer and also a cheap K-Classic battery from Kaufland supermarket. None of the batteries says anything about its mAh capacity, it's always just "super long lasting", so I made a test using my battery analyzer. The result was quite surprising! This is my homemade battery analyzer: http://danyk.cz/avr_aku_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I test a Chinese 12V "2A" switching power supply designed for LEDs, CCTV, routers, etc. It cost me only $ 1.80 including shipping. The actual current capability is about 0.5A and the safety is quite questionable. It's a classic 2-transistor switching power supply with an optocoupler, but it's quite underrated, has poor mains isolation and misses basic safety features like a fuse. It may be dangerous and it can only supply 1/4 of its rated current. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

An experiment with an old Transporta lift. I was trying to LEVITATE inside of it. This allows me to ride it with open doors. This lift can run with open inner doors when empty. The doors don't have to be closed when a weightless ghost rides this lift :). The (relay?) logic doesn't seem to be surprised that buttons are being pressed inside an empty lift :). This is what I call a non-ghost-proof lift. Don't try to do what you see in the video - this may be dangerous.

This is a teardown and schematic of another interesting device from Ebay. It's called an "Anti-Bark Collar", a "Barking Stop Collar" or an "Electric Shock Dog Control". It's simply a collar you put on your dog's neck. When the dog barks too much, it will get a little electric shock. First bark activates a short warning beep only. Second bark activates a longer warning beep. Next 4 barks will activate 4 shocks with an increasing intensity. More barks within 30 seconds are ignored. After 30 seconds, the sequence can start again. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a totally amazing device! So many purposes. It contains a camping lantern, a flashlight and a fan. It also works as a USB power bank to recharge your phone. It's rechargeable and it can be charged using a solar panel or a mains plug...... But wait !!! There's mains voltage in my iPhone metal body !!! The problem is that the circuitry is not isolated from the mains. Including the USB port. This is one of the most insanely dangerous products I've seen so far. WARNING: -Do not purchase or use this lantern. -Never do what you see in this video. -Risk of electric shock and death. -Risk of fire. -You do everything at your own risk and responsibility. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

UPDATE: The big double Schottky diode has 2 anodes and 1 cathode. Sorry, I accidentally told it the wrong way around :). In this video I show how to repair an ATX computer power supply and what are the most common failures. Most of these tips can apply to any switch mode power supply (SMPS). Watch my previous video - How Does a Computer Power Supply Work: https://youtu.be/Cur3nQjjyyo Schematics of AT and ATX computer power supplies: http://danyk.cz/s_atx_en.html My ATX power supply tester: http://danyk.cz/atx_t_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/ WARNING: -This video is not intended for laymen. -Computer power supplies contain hazardous mains voltage! -Risk of electric shock and death. -Risk of fire. -Leave repairs to professionals. -You do everything at your own risk and responsibility.

Explaining how does an ATX switching computer power supply work. In the next part I'm going to explain how to repair it and what are the most common failures. Full schematics of many AT and ATX computer power supplies: http://danyk.cz/s_atx_en.html How to modify an AT or ATX power supply to a bench power supply: http://danyk.cz/at_atx_en.html WARNING: Never open a computer power supply or any other mains voltage device. The mains voltage is dangerous! Risk of electric shock and death. Risk of fire. Leave repairs to professionals. You do everything at your own risk. This video is not an instruction. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of 3 more Chinese electric shock prank toys. A lighter, a chewing gum and a laser pointer. All of them give you an electric shock when you try to use them. The chip drives the high voltage boost transformer at 100Hz. The output has 300V peak voltage and a current up to 4mA. Warning: These devices may be dangerous. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Opening and examining a 3W LED reflector light bulb made by Livarno Lux. It cost me an equivalent of $1.75 in Lidl supermarket. WARNING: Mains voltage is dangerous! Risk of electric shock and death! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I'm reverse engineering the schematic of a very simple 5V switching power supply (probably a phone charger) and describing how does it work. It's a super simple single transistor design, but it has a proper fusible resistor, EMI filter and a very good isolation, so it looks safe and compliant. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I'm testing a tiny 18650 Li-Ion / Li-Pol cell charger and then taking it to bits, including an autopsy of the transformer. It contains a 2-transistor switching power supply with no optocoupler and a Li-Ion charging circuitry with no dedicated charging chip. There are just two transistors and a TL431 voltage reference. I reverse engineer the schematic and explain how does the switching power supply and the charging circuitry work. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing a crazy Chinese "toy" from Ebay called "Police Shock Electric Baton". It looks like a tiny electric baton or stun gun, but it actually is an electric shock prank device. Not only it applies a high voltage to the electrodes, but also to the switch button! WARNING: This device deliberately gives electric shocks to humans! Risk of injury or death. This device may be dangerous, especially for children, elderly, people with medical conditions or people sensitive to electric current. Purchase or use it only at your own risk and responsibility. This device may be illegal in some countries. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

I'm opening an 18650 Li-Ion cell charger and reverse engineering its schematic. Then I'm explaining how does a switching power supply work. This time it's a simple 2-transistor switch mode power supply (SMPS) without an optocoupler. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I took a look at the crazy MC105 "400kV" DC high voltage step-up boost inverter from Ebay. The actual voltage may be about 20-30kV. The module created about 2-3cm long very bright and very loud sparks, then it stopped working after several seconds. I've made an autopsy of it and managed to reverse engineer the full schematic, despite it's not easy with a resin filled module. It's a self-oscillating circuit (similar to a joule thief) with a single transistor and a high voltage transformer. At the secondary, there's a (probably 5-stage) multiplier with 5 high voltage capacitors. I'm not sure what is the purpose of those high voltage generator modules, but they are most likely modules for a stun gun or a taser. They also could be power supplies for gas ignition, CRT or x-ray tube, flocking or so. WARNING: Dangerous high voltage! Risk of electric shock, injury or death! You purchase or use this module only at your own risk and responsibility. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Test and teardown of a PowerBank designed for two 18650 Li-Ion batteries. The sellers on Ebay call it "DIY" for a simple reason - it comes with no cells and you have to put your own 18650 Li-Ion cells into it. For just $1.19 including shipping its not so bad, but there's no fuse and no protection against wrong polarity. WARNING: Batteries and power banks can catch fire or explode! Risk of fire, injury and burns. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Taking a look inside a cheap Chinese rear bicycle light with five red 5mm LEDs. It runs on a pair of AAA batteries. Quite funny instructions + me drawing pictures again :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I'm examining and repairing my faulty USB phone charger (5V 1A switching power supply). It failed after 2 years of seldom use. I've drawn a partial schematic in the video. Full reverse engineered schematic of this charger is here: http://danyk.cz/reverz33_en.html WARNING: Mains voltage is dangerous! Risk of electric shock and death. Risk of fire. Leave repairs to professionals. You do everything at your own risk. This video is not an instruction (this is just my vlog). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

This is a really amazing piece. Just like any other Chinese battery charger, it has a very poor mains isolation, EU plug that doesn't fit EU socket, slight overvoltage, no fuse or EMI filter, .... But on the top of it, it has two pairs of 9V terminals that go nowhere!!! It pretends to be able to charge two rechargeable 9V batteries, but the contacts are really not connected to anything! This is just absolutely awesome. I have never seen this before. I didn't draw the schematic because the circuit is almost the same as in this 18650 Li-Ion cell charger: https://youtu.be/OU5WQTAtaUo You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I was trying to recharge the disposable one-time single-use power bank (the eco-disaster) from this video: https://youtu.be/iEmTh1PMQyY Despite being designed as a one time charger, it appears to contain a rechargeable Li-Ion or Li-Pol cell. Warning: Batteries (rechargeable or non-rechargeable) may be dangerous. Risk of leakage, fire or explosion at any time, especially when in use, in case of overcurrent, short circuit or when being recharged. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A very simple Li-Ion battery charger from China. It contains a very simple 2-transistor switching power supply and a voltage regulation with just a Zener diode. There's also an indication circuitry to indicate charging / fully charged using a red / green LED. This is done using only a 3-pin LED and resistors, without any active components. This power supply has no fuse and a questionable mains separation, so it may be dangerous The output voltage is very poorly regulated and in this case it was 4.45V, enough to make a Li-Ion battery catch fire or explode. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Aluminium foil is generally considered safe to use for food, but this is an example of when it may be quite dangerous. In this video I reveal a possible health risk of an aluminium foil. Covering a steel pot or other metal container using aluminium foil may not be the best idea. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing a cheap Chinese dash cam and then taking it totally to bits. I also opened its car charger and reverse engineered its schematic. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

My cat does weird things in the bathroom. Finally, she got caught by a hidden camera. She's an unauthorized plumber!

In this video I take a look at an ecological disaster - a DISPOSABLE powerbank. It's a power bank you use just once to charge your phone and then you trash it. Yes, a plastic box with a battery and a circuitboard trashed after single use. On the top of it, the capacity is very low and it gives my phone only 22% charge! I would have to use 5 such chargers to charge my smartphone fully. This one costs $ 2.20, so just one full charge would cost me $ 11! That's just awesome. It seems that the battery inside is rechargeable, but the powerbank is designed as a one time device just to make more money, with absolutely no respect for the environment. This one has a universal plug that fits both iPhones and micro USB phones (Android). It says the capacity is 1000 mAh, but a lot is being lost in the converters. It gives my 2600 mAh phone battery a 22% more charge, which is 572 mAh only. Trying to recharge it and measuring the capacity of the cell here: https://youtu.be/5n5iVlKo4xw You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Today I'm testing, comparing and reviewing two very cheap Chinese dash cams for just $7 and $8. WARNING: Those cameras are banned in some countries. Their use may be illegal. Those cameras or their chargers may cause fire or damage your vehicle. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I managed to buy 2pcs of those 18650 Li-Ion batteries for $3 including shipping. That's $1.50 per piece. My battery analyzer says about 2400 mAh. The listing shows batteries marked KR 18650 2000mAh 3.7V. The ones that arrived had no marking, but the actual capacity is even higher than what the listing says. Those are the cheapest 18650 Li-Ion cells I have ever bought on Ebay, yet the best capacity ones. The list of all Ebay 18650 Li-Ion cells I have tested: http://danyk.cz/test18650_en.html My DIY battery analyzer: http://danyk.cz/avr_aku_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I'm testing another cheap Li-Ion 18650 battery from Ebay. This one cost me $2.30 including shipping. The 2300 mAh capacity is not impossible in the real world, but my battery analyzer says only 949 mAh. The battery weighs 37g. I'm not sure is it a fake production, a rejected defective cell or a cell taken from e-waste, for example old laptop batteries, and repackaged. You be the judge. But I think having barely 1Ah it is not worth it. Warning: Li-Ion batteries may catch fire or explode. It is dangerous to disassemble them. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I open a broken vacuum cleaner, show what's inside and explain how does it work. I also talk about the most common failures and explain how to repair the most simple one. WARNING: -Never try to open or repair a vacuum cleaner unless you are qualified for it. -Dangerous voltage, risk of electric shock and death. -Dangerous moving parts, risk of serious injury. -Springs in tension can also cause injury. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I'm testing a dangerous Wireless Charger (Qi Charger) from China. The efficiency is about 45% in the very best conditions. The transmitter has a poorly aligned connector which you have to fix yourself before you can use it. But the best is coming. The receiver has an overheating component, probably a resistor. It gets steaming hot and melts through the cover. You are supposed to put the receiver inside your smartphone, so it is squeezed against the battery. Yes, a red hot resistor is pressing directly onto the flammable Li-Ion battery! This amazing device is going to set your mobile phone on fire or make it explode. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I test some Chinese laser safety glasses (goggles). Can they really protect your eyes against a powerful laser beam? Warning: lasers are dangerous and can permanently damage your vision. No glasses or goggles can give you 100% protection. Use a camera to observe laser. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Examining the internals of a tankless gas water heater, explaining how does it work and repairing it using a vacuum cleaner. It was showing an error code "F.28" in random intervals. After vacuum cleaning the air intake mesh, the gas / air mixer, the burner and the primary heat exchanger, this gas water heater works again :). It's also useful to keep the ignition electrodes and the flame sensor electrode (ionisation electrode) clean. WARNING: -Gas water heaters (water boilers) are very dangerous! -Never try to repair or disassemble them! -Risk of injury, electric shock, fire, burns, explosion, gas leakage, gas poisoning, water leakage and so on... You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I am salvaging some free 18650 Lithium-Ion cells from old laptop battery packs. Sometimes you get a pack with almost new cells, sometimes the cells are partly worn, sometimes there's one or few totally dead cells and the other ones are good, like new. The cells are often discharged to nearly 0V and this leads to a damage that causes a high self discharge rate, but usually you can recover them by making several charge - discharge cycles or by trickle-charging. Warning: Li-Ion cells may explode, catch fire or cause burns! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I decided to explain what a nixie tube is, how does it work and to make its autopsy. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of a Chinese super powerful "Cree XML-T6" LED flashlight from ebay for just 16 USD including shipping. It comes in versions with 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14 LEDs. I have chosen the 11 LED version. The maximum LED power is almost 20W and the total current of all LEDs in parallel is about 6.5A. It runs on 4 pcs of standard 18650 Li-Ion cells (3.7V). It has 5 modes: High, Medium, Low, Strobe and SOS. There's some microcontroller and MOSFETs to switch the modes and to regulate the brightness using PWM. The current of the LEDs is limited simply using power resistors in series. The most amazing thing about this torch is that there's a piece of cardboard in between of the LEDs and the heatsink! The screw thread of the ring is too short, so they just put a cardboard under the LEDs to stop them from rattling! After a simple modification, it works well. Nice "finish at home" design :). All four batteries are in parallel, so if you put some of them in reverse, a fire is about to happen. But for just 16 usd it's a really nice and powerful flashlight. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A teardown of a Glucometer - a medical device that people with diabetes use every day. In this video I find out how this device works. This is a 1980's Glucometer I've got from an antique shop for one dollar. Modern Glucometers may work a different way. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Neodymium cube magnets levitating a piece of diamagnetic pyrolytic carbon

I was trying to build a magnetic levitation machine using neodymium magnets and a piece of pyrolytic carbon (diamagnetic material). Flat magnets didn't work, but 10 x 10 x 10 mm cubes seem to be good for this. The pyrolytic carbon is 10 x 10 x 1 mm. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I show my 20 years old joule thief, I explain how does it work and then I build another joule thief, so you can see the entire process step by step, easy to understand for beginners. Joule thief is the most simple type of a switching power supply or a boost inverter. In the simplest version it is made of only 3 components - a transistor, a transformer and a resistor. It can boost the voltage of a single AA or AAA battery (1.5V) to 3V for a white LED. It starts to work at 0.45V and once started, it runs down to 0.3V, so it can run even on a flat battery, which can no longer power up any other appliance. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing and disassembling two super cheap MP3 music players from Ebay for $0.90 and $1.60 including shipping. The cheaper one doesn't even have a display - you just blindly switch the songs. The more luxury player has a display, flashlight and even a loudspeaker, so you don't have to use earphones. None of them has any internal memory, so you have to use your own Micro SD card. They are not so bad, but the batteries really don't last long. Usually about 10 - 30 minutes only. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown of a hot melt glue gun that exploded when I was using it. I tried to plug it in once more and it exploded again, this time on camera :). By the way, what do you think about glue guns? Are they clever universal tools, or just overused tools for lazy people to botch up everything that could be mounted properly using a different method? You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Another deadly dangerous insect (and people) killing device is here. Test, teardown and schematic of a cheap Chinese plug-in fly zapper (mosquito killer) from Ebay for just $1.60 including shipping. You can very easily touch the high voltage grid. The protective bars have very big gaps and they are very soft The protective cover comes off almost instantly. This can zap you even when unplugged, because the capacitors have no discharging resistors. There's also no fuse. The capacitors rated for 400V run at 620V. The LEDs should be ultraviolet (UV), but they are blue. I'm not sure this is going to attract any insect. But at least, it didn't blow up :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of a Li-Ion 18650 battery charger from Ebay for just $1 including shipping. It's a very clever design, but it also is quite dangerous. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

List of all 18650 Li-Ion cells tested so far: http://danyk.cz/test18650_en.html I have tested another four cheap 18650 Li-Ion batteries from Ebay. Two very low quality "2200mAh" cells, one obviously fake "3800mAh" cell and a used recycled 2400mAh UltraFire cell that probably came from e-waste and was rewrapped. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing Duracell rechargeable 1.2V AA NiMH cells (2500 mAh) after 7 years of storage and a generic NiMH AA cell (2100 mAh) after 8 years of storage. I don't say that those cells are poorly made, but the NiMH technology just doesn't allow a long storage. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Video from the only building in the world with 3 working paternosters. Reminder of the old days when engineers were not nannies. Remember: Standard elevator kills you when it fails. Paternoster kills you only when YOU fail. Dangerous is only what makes you harm without your fault. Otherwise, it's just non-idiotproof :).

In this video I show four different Antique electrical appliances. Enjoy my little time travel to the good old days :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing a mains voltage LED from China. This one is rated 220V and 20W. It really can be connected directly to AC mains with no LED driver. 30W and 50W versions are also available. In the listings it's called "smart IC" or "integrated driver" or "driverless" COB LED. WARNING: -Mains voltage is very dangerous. -Risk of deadly electric shock. -Never try to do this! -This video shows very inappropriate handling of mains voltage! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Taking a look inside one of my power tools - a NiCd (NiCad) cordless screwdriver from 1997. It still works well after 20 years. The schematic is surprisingly simple. It's amazing how simple those NiCd tools are compared to the Li-Ion ones and how long they can last. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I am comparing two flashlights (each for $2 including shipping from Ebay). I'm taking one to bits. The other one was taken to bits in another video: https://youtu.be/t2yVq0LTQX4 The torch taken to bits here seems to contain 1W LED and runs on 3x AAA battery. The other one (SkyWolfEye) seems to contain 3W Cree XP-E LED and runs on a 3.7V Li-Ion 18650 cell. Both are zoomable and have 3 modes (Low / High / Strobe). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I was trying to simulate what happens, if the chip goes short circuit inside a power bank with a 18650 Li-Ion cell. As usually, my experiment went wrong. You can enjoy lots of smoke and fire. Never try to do this experiment, it is very dangerous. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a Chinese water electrolyzer - a device to analyze the drinking water and test its quality. It uses electrolysis to indicate some dangerous chemicals and substances in the drinkable water. Water changes color according to its contamination. The process "reveals" the dirt in the water. In reality, the dirt comes from the electrodes dissolving, not from the water. No water except distilled water can pass this test. Is this to advertise a distilled water for drinking? The worst thing about this device is that the bare metal electrodes are connected directly to 220V mains just via a bridge rectifier. A deadly electric shock is almost guaranteed. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

It says "Load: 300 000 W. Saves 40% Power". Really? I decided to test another version of the popular Chinese Power Savers / Electricity saving boxes. This time it is the metal box version. Having no grounding, this means a risk of electric shock. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing a car voltmeter (car voltage meter / monitor) from China with LED display. The listing says it is for both 12V and 24V cars and it has 8 - 30V range. It seems to have a self-melting feature :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing another version of the popular Chinese Electricity Saving Box (plug-in power saver). Just plug it into any socket of your house and save 30% of power and electricity bills. Does it actually work? Let's see... You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

This is a teardown of a Chinese insect zapper (or mosquito killer). It has a completely mad circuit that makes no sense - probably a totally botched up conversion from a fluorescent tube to a UV LED). After a few seconds, two resistors started to burn inside. It also has no discharge resistors, so the grid and the plug can give you a shock after it's unplugged. The picture in the listing says it also kills rats, although I really can't imagine how the rodents could get through the grid into the machine (which, at the top of it, is meant to hang from a ceiling). Warning - dangerous voltages. There's a high voltage in the grid with no mains isolation. Capacitors do stay charged after turned off / unplugged. UPDATE: I've got a full refund for this rubbish. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I talk about my accident with giant neodymium magnets. Miraculously, no fingers were lost. Just 2 neodymium magnets were destroyed. The most fascinating thing about this was, that the magnets were glowing. After the collision, the magnets were covered with yellowish glowing spots that slowly faded out. I'm not sure about the explanation, but the impact was probably so strong that it set the small fragments of the magnets on fire. The moral is, that neodymium magnets really are dangerous, they are not a toy. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Recently I've noticed that strong neodymium magnet affect fluorescent tubes (it makes them brighter). I was wondering what is happening inside of the tube, so I tried it with a UVC Germicidal tube. It's just like a fluorescent tube, but without the phosphor, just with a clear glass. It turns out that the magnet distorts the discharge / arc. The arc gets longer and thus brighter and it also gets closer to the phosphor, which also makes the tube brighter. Warning: Don't try to do this! Mains voltage is dangerous. Big neodymium magnets are also dangerous. Fluorescent tubes and UVC tubes contain hazardous substances. Germicidal tubes emit UVC light, which is very harmful to everything alive. It can seriously damage your skin or vision! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Showing my giant neodymium magnets that I use for some of my experiments. What you see in the video is NOT the right way of handling big neodymium magnets! As usual, I do something nobody should ever do. Never try to do this! You do everything at your own risk. Neodymium magnets can crush your fingers or hand. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I accidentally noticed a strange phenomenon - the strong magnetic field of a neodymium magnet can boost the power of a CFL (Compact Fluorescent Lamp). WARNING: Don't try to do this. This may destroy the CFL. Risk of electric shock, fire or explosion. The CLF contains toxic substances. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown and autopsy of a CFL (Compact Fluorescent Lamp) with a strange defect from manufacture - it has very dim pink light and never warms up to full brightness. It is rated 9W but only draws about 5.6W. WARNING: CFL contains deadly mains voltage and hazardous substances. Don't do what you see in the video. This is how mains voltage shoud never be handled! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I demonstrate some radioactive items that are (or used to be) a part of our households or everyday life. For example, Fiesta Ware dishes, uranium glass, thorium lantern mantles, smoke detectors or radium watches. I use my 1962 military Geiger counter RBGT-62 and my homemade digital Geiger counter with an alpha sensitive (mica window) Geiger tube to measure the items. Warning: Those items may be dangerous, especially when broken or opened! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A vintage 1962 Czechoslovak cold war military Geiger counter RBGT-62 in operation. After 55 years this amazing machine still works well. I am showing how to put it into operation and measuring some radioactive items like FiestaWare, thorium lantern mantle and radium watches. WARNING: Never try to do those experiments. Radioactive items may be quite dangerous. You do everything at your own risk! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of another 75 cent Chinese LED light bulb from Ebay. This time it is a corn type called 9W, but the actual power is 3.3W. Again, thanks to the Ebay trick, I've got this one for only 75 cents. The listings usually have heaps of options. One option or combination of options is super cheap to get the listing to the top of the search results when sorted the cheapest first. It this case, the super cheap combination was this 9W LED in warm white option, 220V option and B22 socket option. All the other combinations were $2.50. This lightbulb with 3.3W actual power is not so bad; it is so far my most powerful 75 cent LED :). But I don't like the fact that it doesn't have any fuse or fusible resistor (fire hazard). The filter capacitor is only 2.2uF, so it flickers a lot. It has a capacitor dropper with 680n 400V capacitor. There are 30 LED packages in series. Each package has 3 LEDs in parallel. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of another two wired USB computer mouses / mice from Ebay, for $1 each. One of them works really well for its price. The other mouse is almost useless. Conclusion: a super cheap mouse can really work, but not all of them. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Stalking my cat in the dark using my night vision iPhone How did I turn my iPhone into a night vision: https://youtu.be/K9euy3tdyFc You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Some footages recorded in a pitch dark using my iPhone modified to a night vision. More about my Night Vision iPhone: https://youtu.be/K9euy3tdyFc You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is how to modify your iPhone to a night vision! Simply see in the dark! It turned out that this hack is very simple in an iPhone 6S clone. The infrared (IR) filter is on the lens, not on the chip (CCD / CMOS sensor) and the camera is a very simple focus free type, so it is not a problem to remove the IR filter. Then you just add IR LED illumination and that's it. Use 850nm IR LEDs with about 35 - 50° angle. I have used 5mm 100mA types (HIRB5-43G-C). Look for most efficient ones (IR LED radiant power is measured in mW/sr). IR LEDs can be connected instead of the original flash LED, but some cameras turn off the flashlight function when camera is active. So you can connect the IR LEDs directly to the battery just via a resistor and a switch. This also allows for more power. Some types of plastic and other materials may be transparent in IR light, so this hacked iPhone can also work as an X-ray vision :). The iPhone 6S clone disassembly / teardown video: https://youtu.be/GwhzGunT4Xg WARNING: Fire hazard! The Li-Ion (Li-Pol) battery can ignite or explode at any time, especially when in short circuit, damaged, punctured, heated or overcharged. Intense infrared light can be harmful for eyes. When moving in dark, you may suffer an injury. I do not take any responsibility for any of your harm. You do everything at your own risk. This modification voids your warranty. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a teardown of a fake Chinese iPhone 6S and an instruction how to open it up. Of course, you lose your warranty by doing this (if the fake iPhone had a warranty) and this can also destroy the iPhone. Also keep in mind that the battery may catch fire or explode. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

In this video I show my nixie clocks and other clocks (VFD, numitron, LCD and LED clocks) I have built + one nixie thermometer. Details about those clocks (with schematics) are on my website: http://danyk.cz/index_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

What are all those square (or rectangle) stickers on items in supermarkets? Those are part of Electronic Article Surveillance (EAS). The labels are Electro-magnetic (EM), Acousto-magnetic (AM) or Radio frequency (RF) tags used to prevent shoplifting. They are detected by antennas at the exit of the store and trigger alarm. If the item is paid, the tag is deactivated and doesn't trigger alarm. The RF ones are a simple resonant LC circuit which is being deactivated by a strong signal that shorts out the capacitor. I managed to find one RF tag (this is the square one) that wasn't deactivated, so I tried to build my own simple detection circuit and measure its operating frequency. The nominal frequency of the RF labels in retail stores is 8.2 MHz. I have measured 8.65 MHz. This is pretty close given how inaccurate those low cost disposable resonant circuits must be. The oscillator in my schematic is built with 74HC14 (6x Schmitt inverter). One inverter as RC oscillator, one inverter as a buffer and 4 inverters in parallel as a power output stage. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

In this video I decided to make a teardown of a cold war military Geiger counter RBGT-62 made in Czechoslovakia in 1963. It is a classic geiger counter with an analog scale and sound indication (typical clicking noise). It is in a very sturdy metal housing and it is made mostly of Czechoslovak Tesla parts. The geiger tube is a soviet STS-5. It has 3 ranges: 1, 10 and 100 mrem/h. It runs on 2x D batteries. This one doesn't work, but I will show a working piece in another video. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

After my shower hose broke, I got a crazy idea. The hose shielding is made of metal, so why not to turn it into a suicide self-heated electric shower hose. Just connect a voltage to the ends of the metal hose to heat it up! And of course, the voltage is going to be the MAINS VOLTAGE! ... and a deadly shower is prepared :). WARNING: Definitely don't try to do this experiment, it is extremely dangerous! Risk of fire, burns, electric shock and death. Toxic gases may be released. Electric wiring may be damaged (or set on fire) by this. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of a super cheap $1 "Police" LED flashlight. It runs on one AA 1.5V battery. It says 3W and 2000lm, but this would imply 667 lm/w efficiency (!!!). The world's best LED has only about 160 lm/w. The actual power drawn from the battery is about 0.375W (250mA). It contains just a single standard 5mm LED that's usually rated for 20-30mA, but it is driven at about 100mA (!!!). It uses a boost (step up) inverter with an inductor and a 3-pin chip to drive the LED. Running an LED at 4x its designed current, this flashlight is just a piece of rubbish. It's not really worth the $1. The 2$ one is far better. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Taking a look inside an old Russian / Soviet VFD clock Elektronika 4 (G9.02) from 1978 with VFD displays in a nixie tube shape. More about this clock and other vintage digital clocks: http://danyk.cz/stare_digi_hodiny_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing a tiny Chinese $2.20 analog multimeter with 1000V AC / DC range. This little thing has very small probes, thin cables and loose plugs. There are tiny SMD resistors in it, about 0.6mm spacing between PCB tracks and no fuse! And this has to handle 1000V AC / DC. The scale and the screws are rusty and the battery doesn't fit into it properly. I also have an older version of it (about 15 years old). The only difference is that the old version had THT resistors, the new one has SMD ones (and this makes it even worse). If you really want to use such multimeter, use it only for safe voltages and low currents. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Measuring the short circuit current of a cheap Chinese 18650 Li-Ion cell from Ebay and finding out how those guys actually get the 35A discharge current rating. Yes - the discharge current rating of a Chinese cell actually is its short circuit current :). So you get the 35A, but with 0V output voltage and just a few seconds before the cell is destroyed or even bursts into flames. Warning! never attempt to do this experiment. Risk of fire, explosion and burns. The list of Ebay batteries I have tested: http://danyk.cz/test18650_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A big test of cheap Ebay Li-Ion 18650 batteries. This time I tested 7 more types and found that 2 of them are real. The 1800mAh and 2000mAh cells really have the declared capacity. They cost $ 3.76 per 2 pcs, this is only 1.88 per cell. On the other hand, the fake cells rated 2 500 - 12 000 mAh actually are only 400 - 550 mAh. And they are more expensive than the real ones! List of all tested batteries: http://danyk.cz/test18650_en.html My DIY battery analyzer: http://danyk.cz/avr_aku_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Trying to circle through a vintage Paternoster lift / elevator. What happens if you go through the basement and over the top? Do you go through the center of Earth to China? Do you fly through the roof? No, you just turn over and you have to beware of the wheel. Paternosters are deadly, let's ban them.... but why don't we also ban all the deadly cars, cigarettes, guns, big dogs, junk food, knives, airplanes, swimming pools ... ? A standard elevator kills you when it fails. A paternoster only kills you when YOU fail :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Visiting a paternoster elevator / lift. It has no doors and never stops. You simply get on and get off while it is moving. Somebody may call it dangerous, I call it just a bit less idiot-proof. You are statistically more likely to get hurt on stairs. People need some caution to stay alive, just like any other animal. This elevator is one of few remaining things that keep our survival instinct alive. Last reminder, that the real world is not a nursery. And it is also a lot of fun to ride :).

In this video I'm trying to change LED in a computer mouse for different color. The cheap mouse doesn't work well on shiny surfaces with the original red LED, but it works much better with white and especially blue and green. On the other hand, infrared (IR) and ultraviolet (UV) LEDs are apparently not a good idea. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Repairing a vintage Russian / Soviet alarm clock Elektronika 12-41 from 1985 with VFD display. As usually, the problem was a dry electrolytic capacitor. My virtual museum of Soviet alarm clocks: http://danyk.cz/stare_digi_hodiny_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is an old Soviet / Russian digital alarm clock Elektronika 2 - 06 with a big VFD display. tt is made in 1982. I have just restored it and decided to make a video about it. It has a big VFD display IVL1-7/5 (some versions may have a simmilar ILC4-5/7L). The digits are 21mm high. Sometimes people call this a nixie clock, but actually it contains a vintage vacuum fluorescent display (VFD). It has 3 chips in it: K176IE18, K176IE13 and K176ID3. It runs from 220V 50Hz mains and draws about 2.3W. Other vintage digital clocks in my collection: http://danyk.cz/stare_digi_hodiny_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a test and review of a very cheap USB tester (voltmeter and current meter). It costs only 1.25$ including shipping from China. It measures the voltage and current of the USB port power rails. The current and voltage are displayed on 4-digit LED display. Its range is 3-8V and 0-3A. It alternates the voltage and current display every 5s. It is a very good tool to measure the current consumption of USB powered devices and also to check USB ports, chargers and power banks. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A teardown and review of the powerful Skywolfeye Zoomable "5000 lm" Cree LED Flashlight from Ebay for just 2$. I was interested what can I get for just 2$ including shipping. This torch claims to have 5000 lm light output, which is nonsense. For 5000 lm, you need about 30-50W LED. The real power output of this one can be about 200-300 lm with a fully charged battery. It uses a standard 18650 Li-Ion cell, which is of course not included. I was expecting a buck regulator or at least a constant current regulator in it, but actually there's just a resistor in series with the LED :). The listing claims it contains a Cree XM-L T6 LED, but actually it is XP-E. The XP-E LED has a maximum current 1A and a maximum power 3.5W. At 1A, the max light output is 307lm. In this torch, the LED is operated only with a series resistor (0.75 ohm) and with a full battery the current is 0.7A and power is 2.2W. There's a chip, but this chip only changes the 3 modes: Full power, low power (25% duty PWM modulated at 560Hz) and blinking (50% duty at 11Hz). The fast blinking is really annoying, can cause seizures and I consider removing the chip completely. After removing the chip, however, you would lose the low power option. Also, because the chip has some resistance, you would have to increase the series resistor value after removing the chip (to about 150% of original value or 1 - 1.2 ohm). But still, this is a very nice and super bright flashlight, much more powerful than I expected for the size and price, and has a very wide zoom range. It has aluminium body with a black finish. The lens is plastic, but I really didn’t expect glass for the price. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is a clever universal travel adaptor with 3 different ejecting plugs. It is sold on Ebay for just $1. The problem is that you can eject more plugs at the same time. When plugged in, the exposed pins of the other plugs are live. It also defeats ground / earth. Ground is not being connected at all, but you can plug into it appliances that need to be grounded. You can also plug just one pin of a plug into it and touch the other one, which becomes live through the impedance of the appliance. You can even stick a ground pin of some plugs into live hole, making the metal cabinet of the appliance live. It claims to have a surge protection, but there's actually none. There's just a red LED indicator with two 74k resistors in series. It has safety shutters, but they don't work at all. It is rated 10A, but the sliding contacts of the plugs are very thin. This is definitely a deadly dangerous device that can result in fire or electrocution. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

List of all batteries tested so far: http://danyk.cz/test18650_en.html Test (and also an autopsy) of cheap Ebay Li-Ion batteries. Those are standard 18650 size with 3.7V nominal voltage. They turned out to be fake. They claim 3000 and 5800 mAh, but the real capacity is only 552 and 554 mAh (!!!). They also say they have a protection circuitry, but they actually have none. In reality, the 18650 size Li-Ion batteries never have more than 3400 mAh, Usually they are 1800 - 3400 mAh. If the capacity seems to high to be real, it usually isn't. Anything over 3500mAh is surely fake. Also if it is too cheap to be real, it usually isn't. The weight of the battery can also be a clue. The real ones weigh about 45g, the fake ones about 24g. Warning: Never disassemble any battery. It is very dangerous. Batteries contain dangerous chemicals and they may combust. UPDATE: 5800mAh battery: Requested refund, seller ignores me. 3000mAh battery: Seller offered 50% refund without having to ship it back or a full refund if I ship it back! More about my homemade battery analyzer: http://danyk.cz/avr_aku_en.html You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Testing the magic Electricity Saving Box, also called a plug-in power saver. Is this a miraculous free energy generator or a mythical overunity device? Actually it is just a pair of green LEDs, few resistors, (fortunately) a fuse and a 1u5 capacitor connected to mains. This 1u5 capacitor is probably meant to compensate inductive loads, but households don't pay for inductive power. It is also just a fixed value compensation, so it is likely to overcompensate or undercompensate the unpredictable inductive load. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Another Chinese USB charger / power supply. Rated 5V 500mA. This one has probably the simplest possible schematic. Just a single transistor, no optocoupler, half wave rectifier, no interference filter at all. The isolation distance on the board is 2.5mm, this is above Chinese average, but still could be better. The transformer is dodgy, it has just 1 - 2 layers of sticky tape between windings. The sticky tape is a bit drifted to the side, so the first / last turn of secondary can possibly meet the primary. There's no fuse, just a chinese "onboard fuse". No inrush limiter. The output diode is 1N4148 rated 150mA, despite the supply is rated 500mA. It has different USB output configuration compared to other supplies. One data pin is connected to GND and the other one is not connected to anything. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

FuelShark, also called car fuel saver or economizer, is a miraculous device that claims to save 20% or more of fuel. Just plug it into the cigarette lighter socket of your car and you magically save 20% of gas. It also saves oil, battery life and environment and even increases the power of your engine! This is what the sellers claim. In reality, this is just a tiny 1000uF capacitor (rated 25V) connected in parallel with car mains. Fortunately there’s also a 2A fuse. There's also an indicator LED with two 1k resistors in series (they could have used one) and a 1.5M discharging resistor. I have no idea how this is supposed to save 20% of your fuel and why the car manufacturers don't put this already into all cars :). But at least, this is a nice flashlight and it tells all passengers that you are an expert :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown and review of the allocacoc PowerCube. Just put an extension socket into a strange shape and give it a cool name and you have a business :). It can have a remote control, but the remote is being sold separately. It has a plug, 4 sockets and an ON-OFF switch with LED indicator. It can switch up to 16A at 220 / 230 / 240V. Its own power consumption is 0.25W in off state and 0.59W in on state. The remote probably works at 433 or 868 MHz. The PowerCube has a 5V switching power supply with a proper fuse, EMI filter and an 8-pin chip. The RF receiver has an unmarked 16-pin chip, that may be a Synoxo SYN470R. There's also a third chip, S003F3P6 microcontroller. The power is switched using a 16A 250V relay with a 5V coil. Strangely, one of the 4 sockets has German Schuko F style guides, despite it is a French style E socket. Only universal European plug fits into it, not the pure E or F. plug The other 3 sockets are normal French E sockets. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Another dangerous USB charger. This one is even worse than the previous one. Not only it is dangerous (can cause electric shock or fire), it is also completely useless. It can't supply the 1A current at 5V. At 0.5A the voltage already drops to 2.7V. The separation of primary and secondary side is only 0.5mm on the PCB. The transformer also looks dodgy and the tiny EMI capacitor (connecting primary to secondary) is only rated 1kV. It has no fuse, fusible resistor or inrush resistor. The boards have no apparent separation line, it is just one jungle of tracks, primary and secondary side riddled like a maze. There are two boards connected with a cable containing both primary and secondary side. Components on one board are touching components on the other board. This is definitely an electrocution device. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

A deadly dangerous USB charger (fake Apple iPhone charger) from China. Sold on Ebay for 90 cents including shipping. The PCB board has only 1mm distance between primary and secondary side. The EMI capacitor between primary and secondary side is only rated 1kV (should be Y1 class with a test voltage of 8kV). The transformer isolation is also questionable. The power supply has no fuse (just mains-bridge-electrolyte!). This poses serious risk of fire. When the power transistor shorts out (and it is likely to do so, because there's no snubber network), the primary of the switching transistor gets essentially connected to mains with no fusing. This is likely to cause a meltdown of the transformer and get mains to the output. An explosive test has demonstrated this :). Never try to do this experiment. Never use this device. Extreme danger. Video includes 2 explosions and 2x tripped breaker. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Teardown of a dimmable 5.5W 470lm LED light bulb from Livarno Lux. Rated 220-240V 50Hz. It is completely filled with a resin. Disassembly was a bit tricky. The circuit is a "little bit" overcomplicated. It has a double sided board with SMD components on both sides, even under the THT components. Drawing a schematic turned into insanity. It has BP3216 chip. The supply seemed to be a buck regulator, but actually it is a switching voltage inverter. This kind of inverter is capable of both step up and step down operation. There's no big capacitor at the output of the bridge rectifier, so that it can work with a triac regulation. The output current of the inverter is proportional to the average input voltage. There are 14 LED packages - Two chains of 7. Each package contains 2 LED chips. Total LED voltage is 40.7V. The LEDs are on an aluminium substrate PCB and a heat sink. This makes contact with another heat sink in the plastic body. This one cost 2.50 USD and comes from a local supermarket. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Test and teardown of the cheapest power bank ever - the 80 cent (incl. shipping) power bank from Ebay. Of course, you have to insert your own 3.7V Li-Ion 18650 cell into it :). What did you expect for 80 cents :)? It works well for loads up to 1A. At 1A the output voltage is 4.94V. At 1.1A the voltage drops to 4.56V and at 1.25A it shuts down. It charges the battery to about 4.2V and discharges it down to 3.1V. While charging, the power bank draws 0.78A from a 5V supply. Red blinking LED indicates charging. Steady red light indicates fully charged battery. Blue light indicates a load. When there's about 10% of capacity remaining, the blue LED starts blinking. The power bank is controlled by MP3401A chip and there are just few other components (3 capacitors, 1.5uH inductor and 2 LEDs). The battery space is little bit too short, but you still can insert the battery. The only problem is that there's no fuse in series with the battery. If the chip fails short, the battery will be shorted. In extreme case, this may lead to fire. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Build your own hand-powered LED flashlight from a CD or DVD drive, an LED and a paperclip. Quick DIY project. It uses a tray motor and gears from an old CD / DVD drive to generate enough power to light up an LED. This is a real free energy. No batteries needed. You can even use 2 LEDs in antiparallel, one will light up in each direction of rotation. A parallel capacitor can be added to get more steady light output (with maybe a schottky diode in series to prevent reverse current from the capacitor to the motor). A Joule Thief could be connected to the device to get higher voltage or to light up an LED at a lower RPM. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This video shows step by step how to disassemble an old HDD (Hard Disk Drive) and get strong neodymium magnets from it. Warning: Neodymium magnets can crush your body parts! A broken neodymium magnet can be very sharp! The magnet removal destroys the HDD! You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This dangerous mysterious vintage device is an adapter from an E27 light bulb base to a double power socket. Yes - this allows you to power any appliance (actually two) from a lamp or light. So you can load the light circuit or a table lamp with up to 2x 2kW appliances, while the light circuit is heavily overloaded, socket pins are partly exposed and the light bulb melts the appliance's cable. While plugging the appliance, you can also stick your fingers into the empty E27 base if no light bulb is there, or the light bulb can burn your hand (choice is up to you :)). By pulling the cable, your lamp falls from a table and the light bulb breaks, starting a fire or exposing bare live electrodes. You also can easily tear a light from ceiling. And of course, this effectively defeats ground for grounded appliances and allows you to plug one pin of the plug only, while touching the other one (that becomes live through the appliance). So this device is just totally awesome :). Fire or an electric shock almost guaranteed. If you have one, definitely use it at your own risk. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Sharing my explosive experiences with dangerous multimeters and recreating the explosion of the probe that originally exploded inside my hand. Some multimeters can't handle mains voltage on some ranges, despite the manual claims they should. They often claim maximal voltage to be 500 to 1000V, despite the fuse is rated only 250V. The cables have very thin copper core, despite being rated 10 or even 20A. In use, they get very hot. As the cables of the multimeter are frequently used and are exposed to bending, the copper core slowly breaks, until just few hairs remain. This mostly happens where the cable leaves the probe. Then you measure a high current (like 10A) and the cable just EXPLODES!!! This is exactly what happened to me while measuring the current of a 230V 10A load. The multimeter probe exploded in my hand and miraculously only burned me but it didn't electrocute me. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Ebay sellers always add a super cheap item option into the listing to get it to the top of the search results (when sorted cheapest first). For example, a listing with several types of mobile phones contains a "cable only" option, so that the listing is from 99 cents. This is ridiculous and makes the "cheapest first" sorting useless. Concerning LED light bulbs, it is getting more interesting :). Some sellers add a very crappy "3W" (actually 1.5W) bulb for 99 Cents to draw attention. And even claim it. But some of them add a good quality one, hidden among 100 different types! And they hope that not much people will buy it. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown of a $0.70 red laser pointer from Ebay. Those small laser pointers come in two versions: One with white LED and one with UV LED in it. One button is for the LED and the other one for the laser. It contains three 1.5V button cells (AG3 or LR41). The typical capacity of those batteries is only 24mAh, so the life is quite short, especially because those batteries are intended for very low current devices (watches and calculators). The operating current of the LED and laser diodes is cca 20-40mA and declines as the battery discharges. The LED is connected directly to the battery via a microswitch. The laser diode has a 56 ohm resistor in series. The batteries tend to run flat very soon, but they somehow recover when they are left for a while. The video features my two cats (still kittens). If you don't know, a cat + laser = an insane cat. No cats were harmed during making of this video :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown of a filament LED lightbulb from Ebay for $1.50 including shipping. Rated 220V 50Hz, the nominal power is 2W, real power is cca 1.6W, it has a E14 screw base. It is quite bright and looks nice, but there's no fuse in it. There's also no filter capacitor, so it has a lot of 100Hz flicker (not visible to the human eye unless you move it fast). It has a capacitor dropper in it with a 330nF capacitor, 1M discharge resistor and 1k inrush resistor. The 330nF multi layer ceramic capacitor looks quite small for the mains voltage. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

A Chinese water heater. Not an ordinary water heater at all. It is an electrode heater that heats the water by passing electric current through it. Such device basically connects mains voltage (220-240V) to the water. It contains just a plug, cable and two electrodes connected directly to mains. Those electrodes are being immersed into water. No matter how crazy this seems, this appliance is really sold in China. Numerous sellers on Ebay ship this worldwide and some of them have more than 500 pieces sold during last month. The device comes in two versions - 300W and 500W, but the real power is not limited by any means and depends only on the resistance of the water (thus its chemical composition). I tried to stick my finger into the live water. Electric shock included. By adding salt into the water, I tried to increase the power. The experiment went a little too far. Lots of steam, sparks, smoke, toxic gases, flashes and a tripped 16A breaker. The whole workplace ended up flooded with water, with the live mains equipment floating on it. WARNING: Never purchase or use this device. The experiments in this video are extremely dangerous and should NOT be done by anyone, anywhere, anytime. Risk of electric shock, fire, explosion, injury, burns and poisoning. Toxic substances or gases may be released. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

What happens when you put a monster neodymium magnet to an iPhone :).

This travel adapter from Ebay (cca $1) converts EU socket to almost any other socket. It is dangerous for several reasons. You can plug one pin of a plug into it and touch the other one, that becomes live through the appliance. It also completely defeats groud (earth) from design. The ground output is not connected to the ground input at all! The connections of live and neutral are so poor that at higher current this could lead to fire. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown of an electroluminescent panel, wire and its driver. With a schematic and a funny moment when the EL panel fails and later starts to burn :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Fake iPhone 6S. It has very shaky buttons, low display resolution, low camera resolution and runs Android. The main (rear) camera is only 1600 x 1200 Px (2MPx) and the selfie (front) camera is only 320 x 240 Px! The videos are recorded only in MMS quality at 176 x 144 px (or 144p). That's absolutely ridiculous!

Some general differences between real and fake iPhones. Instead of comparing real and fake of a particular model, I tried to point out some general differences that apply to virtually all generations of iPhone (4, 5, 6, 7, 8, ...). Those rules are not 100% guaranteed, but they give a good clues. I was especially surprised that the fake iPhone 6S can only record videos in 144p quality (176x144) at 7 fps !!!!! The fakers have a really good sense of humor :).

I wondered how much power does an iPhone draw from mains when it is charging. The result is 7W for iPhone 5 and 5W for iPhone 6S.

The actual Night Vision hack instructions are in this video: https://youtu.be/K9euy3tdyFc This video shows a teardown of a cheap smartphone camera. This camera is so called focus-free camera, it has no moving parts and it is permanently focused into distance (infinity). The camera has an infrared filter in between on lens and CMOS chip. There's a possibility to remove the filter and make the camera sensitive to infrared light. With an infrared LED illumination you could have a homemade night vision. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild My Instagram: https://www.instagram.com/savage_danyk/

Teardown of a better quality LED light bulb from Livarno Lux. Bought in Lidl for 79.90 CZK ~ 3 USD ~ 2.50 GBP. Made for 220-240V 50Hz. This one really has the advertised 3W power and it has a proper heatsinking and a (hopefully safe) fusible resistor. I am using another of the same type for cca 2 years and it still works well. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I wondered what can I get for $ 0.70 including shipping from China. On Ebay you can find various E14 or E27 screw base LED light bulb types rated for 110V or 220V sold as 3W. The real power is only about 1.5W. There's no inrush resistor, fuse or fusible resistor. This is probably not compliant with EU standards. Those light bulbs may also be damaged in shipping. The light output is roughly 100lm or less. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Teardown of a huge Chinese LED flashlight. The power is definitely not as high as the size may suggest. It poses a fire and shock hazard. Non-compliant plug. Capacitive dropper charger with underrated 1uF capacitor only rated 250V= for 240V~ with a peak voltage of 340V. No fuse. No inrush limiter. When I came accross this one, the LEDs were already blackened and the Lead Acid battery partly molten (!!!). The manual tells that the capacity of the battery is 1500mAh and recommends 12h charge. but with 1uF capacitor, full charge can never be achieved. The 5mm LEDs (usually rated for 20-30mA) are operated at 45mA. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

I managed to get this magic gadget for just $ 2.67 including shipping, so I decided to get it and make a video about it, including slow motion.

Tattooing the display :). This video shows that a laser can draw on a display of an iPhone or another smartphone. Warning: this is irreversible!

In this experiment, I try to find out what happens if you point a powerful 1W 808nm infrared laser into a camera of your smartphone or iPhone.

Turn your Smartphone camera into a macro camera or magnifying glass :). You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

This is what happens if you put a giant neodymium magnet close to a CRT TV or monitor. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

Slo-Mo video of Ferrocerium - Magnesium flint fire starter in action.

How to start a fire using a magnesium / ferrocerium flint rod. Be careful not to start a bigger fire than you actually want - e.g. burning down a forest or a house!

Incredible Magnet Invention - attracting and repelling forces in equilibrium.

This video shows how to biuld another version of the super simple homopolar motor. You can build it from few parts that you can find at home.

This video shows how to build your own battery from lemons. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

You can support me on Patreon: https://www.patreon.com/DiodeGoneWild

You can support me on Patreon: https://www.patreon.com/DiodeGoneWild