I had two Joule Thief circuits.  I decided to give one away to a new friend I met on Youtube.  I am still impressed by these little circuits and how they use just about any battery size to produce light with LEDs.


The circuit is made with a toroidal inductor, resistor, capacitor, and transistor.

If you are interested in knowing more about the Joule Thief circuit, I have several posts and videos:

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