This circuit is from a bunch of drawings that I have from the years before I started drawing circuits on the PC. It was drawn Jan 8, 2004 and built the next day. The design is much like those found on websites and in electronics magazines with the exception of D1 and R4. I’m not
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As it says, this was built on 26 Dec 2008, the day after Xmas. It uses a high current, high gain transistor for Q2. The 2SC2334 or KSC2334 comes in a TO-220 package. I should remind everyone that the flasher is essentially a slowed down oscillator. It can be used with a smaller capacitor to
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I posted this to my late, great wasts0nseblog but forgot to post it to my new rustybolt.info blog. I wound a third or tertiary winding on a Joule Thief to drive another LED. The LED could have been put in parallel with the existing LED IF it was the same color or the same forward
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This was from June, 2003. I still hadn’t tried to experiment with the single transistor Joule Thief circuit to get it to be powerful enough to drive 3 LEDs. The circuit I used is found here.
I needed a candelabra socket with a switch, like the ones that are available for the regular light socket. But I couldn’t find one, so I improvised. I took the base from a dead CFL and soldered the wires to the candelabra base of the LED light, then positioned it in the ‘adapter’ and glued
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I have a lot of these 600 ohm telephone hybrid transformers that came out of a PBX (see here for much more info). They’re sturdy and well built, and make great audio transformers. Last week someone posted a video to Youtube of some Joule Thiefs that used an audio transformer and the frequency of oscillation
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A long time ago, about 1966, I wanted to modulate a light beam with audio. The LEDs available at that time were indicator grade, not bright enough to go any distance. So I decided I would build a modulator and connect it to a powerful incandescent light. At first I used a burned out car
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