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.
Archive for the ‘Flashlight’ Category:
2012-07-23 RGB LED Light
This LED light is identical to the others with white LEDs, but I used red, green and blue LEDs for a Christmasy effect. The schematic of the circuit is on a post-it inside of the lid.
2012-07-09 Supercharged Joule Thief – Reduced Brightness
Peter is experimenting with my Supercharged Joule thief circuit. His picture is one of his recent results: a Supercharged Joule Thief flashlight. I quote: Hello and thanks for the fast answer, Now I want an SJT as a nightlight cause there are many so called “depleted” batteries lying around – I built one on breadboard
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2012-06-27 Photos of LED Lights I’ve Built (Cont’d)
(Cont’d from previous blog) During the early days of my LED lights, I did some conversions of regular flashlights. The one in the picture is a Craftsman that used four AA cells and a regular incandescent flashlight bulb. I took the bulb out, broke the glass and removed it, and put three white LEDs, each
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2012-06-26 Photos of LED Lights I’ve Built
The LED lights I’ve built decided to have a get-together, so they met up in my kitchen. I think they may be up to some kind of conspiracy. I think they’re angry about not being used. When they were made at the beginning of the millennium, they were the only LED lights available. Well, we
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2012-06-15 8 LED Altoids Tin Light
I managed to squeeze 8 LEDs into holes on the end of the Altoids tin. The brightness is truly awesome. With that much battery current, I could have reduced the 33 ohm resistors a bit. But why push it and waste more battery current? It’s already really bright. That’s why I put the second switch
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2012-06-05 4 White LEDs + 1 Yellow in Project Case – May 2003
I built this in May, 2003 using an expensive plastic project case. It worked very well, and put out a .lot of light thanks to the high performance transistors. I added the yellow LED to make the light a little warmer, since white LEDs tend to have a lot of blue light. The URL I
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2012-06-03 Watson’s Waterproof LED Flashlight
This pic is dated Nov 2003, which was about the time I built the light. It was one of my early creations. I built the circuit which used two transistors (not a true Joule Thief), a toroid, and three white LEDs. Most impottantly it used two AA cells in series, which was kind of odd
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2012-06-01 Joule Thief Light from the mid 2000s
I built this light back in the early to mid 2000s when the LED flashlights were very expensive and generally not available. As can be seen, it runs off a single AAA cell, and lights a single LED. I used point to point wiring, then I put clear silicone seal over the circuit to hold
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2012-04-12 A 12 LED Joule Thief Lantern
I blogged this for a neophyte on Energetic forum. If you’re going to use an existing lantern, then you may have a lot of modifications, since a lantern usually has several cells in a battery pack, which gives you a long battery life. If you reduce the number of cells, the battery life will be
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