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Switch Mode Power Supply Circuits

Circuits designed by David Johnson, P.E.

Last Updated on: Wednesday, April 28, 2010 03:53 PM

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Dave's Circuits:  Frequency to Voltage     Period to Voltage     Sine to Square Wave      Voltage Converters   
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  • 0.5V Negative Supply
    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.


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