Joule Thief

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

Water Level Sensor


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