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"Hobby Circuits for your Hobby Projects"
Last Updated on:  08/29/2008 02:09:28 PM

0.5V Negative Supply
designed by David A. Johnson, P.E.

Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.

Click on Schematic below to view PDF version of this Circuit
Circuit Negative Supply designed by David Johnson, P.E. (May 20, 2005)

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