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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Switchmode Power Supplies

  • 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.

More  Switchmode Power Supplies


Dave's Circuits:  Frequency to Voltage     Period to Voltage     Sine to Square Wave      Voltage Converters   
 Voltage to Frequency     
DC to DC Power Supplies       High Voltage Power Supplies       Voltage Controlled Oscillators

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Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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