With this simple device you can use AA and AAA batteries down to 0.3 volts which is way below the point where these batteries are normally considered dead.
A Joule Thief can keep an LED going for days, weeks or months on a single dead AA or AAA battery. This is also something you can make at home for free in minutes using recycled electronics.
I got most of my parts out of a dead old television for this project. All you need is a toroid form, some wire and a couple electronics components.
This is useful for long lasting emergency lighting or in a survival situation when most of your batteries are too weak to power a flashlight.
You can also use the Joule Thief to power an LED with the Earth Battery I have previously discussed.
There are many exciting uses for such a circuit.
You can read the entire article with instructions here:
http://www.thedoityourselfworld.com/articles/article.php?id=11461
You can watch the video here:
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