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The Joule Thief

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Description

The "Joule Thief"...

will allow you to power an LED from a single 1.5v battery. This transformer-less circuit consists of two bipolar transistors, an inductor, two resistors and capacitor to generate a higher voltage around the 50KHz frequency range. The entire circuit draws only about 15 milliamps.

http://electronics-diy.com/transformerless-joule-thief.php

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