Joule Thief Study

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The Joule Thief circuit is very popular with electronic hobbyists. It can take a virtually useless power source and increase the effective voltage up to a usable level.

This is a small study of Joule Thief's. Are more turns of wire better than fewer? Does the gauge of wire make a difference? Do some toroids perform better for this purpose? How long will a AA battery power the circuit? These questions are answered in this video.
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