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LED light using heat as energy source

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Published on Jul 8, 2012

This is Jonnydavro's Reverse Joule Thief being powered by a heat differential as the energy source. Two Peltier modules in series are used to convert a difference in temperatures to electricity.

Comments • 31

sanjev21
Interesting circuit but size of transformer isn't really portable. I've seen this circuit as posted by "Larskro" Title "Joule Thief very very low input 0,136 volt".He is using 100:10 toroid and successfully ran it using 0.136 volts on toroid.Dedicated TEG generator circuit i noticed from search engine for micro power variant is using "100:1" turn which could work from 30mv or 50mv to power up circuit and yes led.My plan to strap this peltier to wrist with tiny heatsink on it to power up led. 
Andrew Nash
On a more serious note i have a cap on my head that has led in it and have a tec in it that powers the light and auto shuts off when i remove it. I am about to add super capacitors to store the excess energy. Super brilliant and works awesome:)
Andrew Nash
I see only one problem to get around..... These folk who still use fire for light might not want to pull apart their microwave to get the mot out! Just sayin!;)
DrSaminstine
Great work I am going to have to make this one, what about the atmosphere like a aluminum plate and a ground wire like tesla use to use in his experiments it's low voltage but it might be enough to get it going any Antenna will do really, and the ground can be any metal buried with a wire hooked up then let the light begin :-)
FREEGARYMCKINNON
makes me think of the temp difference between the poles and the equator. planetary peltier cell somehow ? !! maybe wirelessly connect the charges ? : )
FREEGARYMCKINNON
this is a winter morning circuit !! ; )
Lidmotor
Great idea. Use a little light----to make alot of light.
Lidmotor
Actually the leds won't do it but the thermoelectric devices will. The problem with them is efficiency. Other cooling methods really work better for cooling down a home. That may be my next project. I started on one a few years ago but I didn't get very far. Summer ran out, it got cold, and I lost interest. Ha.
Lidmotor
I might try a TEG on this instead and see what happens. The solar idea is great and so is wind power ----but what if it is cold, dark, and windless???? This temperature differential idea to make electricity needs to be looked into more. The cost of these thermoelectric devices needs to come WAY down to make it doable though. It is totally impractical now for someone who can only afford a candle. 
Lidmotor
I didn't get a chance to look at the base/emitter voltage on the scope yet. 
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