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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  White LED Circuits      Driver Circuits


The circuit below will drive any LED color, including white LEDs, using a DC power supply ranging from 2v to 3.3v.  White and blue LEDs normally require over 3v, so the circuit below uses a charge pump scheme to deliver a constant LED light intensity from a voltage less than 3v.  The LED is rapidly pulsed with 3ma peak current, which remains fairly constant, even as the battery voltage changes.  This hobby circuit is designed only for low LED current applications.  A common CR2032 lithium coin battery should run the light for two days.  A pair of 2.5 Amp-hour AA NiMH cells should operate the circuit for nearly a month.

Click on Circuit Below to view PDF of Schematic

Schematic 3v White LED Driver designed

 by Dave Johnson, P.E.

More  White LED Circuits      Driver Circuits

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