I found this LED website in Germany, I like it because it’s LEDs, LEDs, and more LEDs, and not an electronics parts distributor. The LEDs are broken down into various types, standard, high power, etc., etc., etc. I’m looking for a similar website of a store in the U.S. I figure it would be best
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I had to spin the shaft really fast to get the LED to light up, and now that I converted the generator (was a CD-ROM drive motor) by adding the Joule Thief to the back, all I have to do is spin the shaft gently and the LED lights up brightly. It’s a big difference;
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I found this 1.5V switched capacitor flasher circuit on talkingelectronics.com (I can’t get a direct link to it). It flashes a red LED; I haven’t tried any other color but the similar Bowden circuit will brightly flash a yellow LED. This is essentially the same circuit I blogged earlier, except this TE circuit uses only
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I received a Google Alert about this regenerative receiver schematic being posted to the RegenRX Yahoo Group (you may have to be logged on the view it). It’s quite complex for a regenerative receiver – the average regen set has just a few transistors. But its Achilles Heel is the front end. When I was
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This weekend I did something I thought I really would never do – I already knew that this circuit was a loser. The guy has a web page with “the simplest LED flasher”, which uses an NPN transistor with the base disconnected and the emitter positive which is supposed to break down at less than
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I commented on a Youtube video and the author replied he found that he could get PC Boards made for cheap from Futurlec.com. I looked at their FAQ and found that they will accept designs made in ExpressPCB, which is what I use. Their cost estimator said I can get the same boards for 44
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What is the fastest Joule Thief in the world? I have had one operating at 13 MHz, believe it or not. What is the slowest Joule Thief? I built one with a large coil, and the high inductance caused it to operate at 1200 Hz, well within the audio frequency range. I think that that
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There are many other uses for common household items, or even stuff that would otherwise go to the trash or recycling. In this case, I built a two transistor “Joule Thief” V Booster on a small perf board, put it inside of a soda bottle cap along with two screws and encapsulated it in epoxy
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The following is from my late Watsonseblog dated 2010 Dec 26 (no pics or links yet). I made this a few years ago when I tried to see how well these two transistor JT type circuits work, and how efficient they are. The coil is a 180 microhenry RF choke with a single winding, and
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I named this “Blinky Booster” dual switched capacitor voltage boost flasher after my Blue Blinky, which used a coil. This dual switched capacitor voltage boost flasher uses no coil or inductor. Last week I got Bowden’s flasher, a single switched capacitor voltage boost flasher, working properly, but it was not capable of flashing blue or
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