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 :).
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.
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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!
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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.
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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.
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This is what happens if you put a giant neodymium magnet close to a CRT TV or monitor.
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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.
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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.
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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 :).
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