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Last Updated on: Tuesday, October 14, 2014 06:33 AM

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More  Constant Current / Current Sink   LED Circuits
Driver Circuits

Constant Current LED Driver


Bob Pease from National Semiconductor came up with this circuit and I have used it many times.  It maintains a constant current through one or more LEDs.  A single resistor controls the desired current.

Click on Drawing Below to view PDF version of Schematic

Circuit Constant Current LED Driver, David Johnson & Associates


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