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Joule Thief

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This circuit is useful for driving LEDs with a single AAA cell.  The transformer steps up the Voltage.  The transistor turns on because the base is pulled up. However, when it turns on it produces a negative current on the base, which turns it off causing oscillations which are in the range of 50KHz. 

Joule Thief Schematic

Joule Thief Schematic

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