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Old 11-14-07, 08:23 PM   #1
geo8rge
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Useful circuit for DIY LED lights

This circuit will suck every last bit of energy out of a battery and send it through a 3v LED.

http://www.evilmadscientist.com/article.php/joulethief

http://www.makezine.com/blog/archive..._weeken_1.html
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Old 11-15-07, 07:26 AM   #2
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Thank you for this. Would the Joule thief work with a 3 LED 3 volt flashlight head for a Maglite? I made a headlight for my bike with one of these.

I have a small box full of "dead" AA batteries I wanted to recycle, but no one here takes them any longer. Many of them still have about 1 volt left. I do have an LCD desk clock I power with them, but a set of three to make 3 volts lasts a long, long time and I would never be able to use all of them this way.
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Old 11-15-07, 02:02 PM   #3
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It should work with any 3v circuit. I am curious as to the amps it puts out, and how long it takes to build up to 3v and discharge.
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2000 Montague CX, I do not recommend it, but still ride it.
Strida 3, I recommend it for rides < 10mi wo steep hills.
2006 Rowbike 720 Sport, I recommend it as an exercise bike.
1996 Birdy, Recommend.
Wieleder CARiBIKE (folding), decent frame.
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