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Dave's Circuits
Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
 Last Updated on: Friday, July 18, 2008 11:34 AM


    AC to DC Converters
 
MINIATURE ISOLATED AC/DC POWER SUPPLY
This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer. The voltage spikes produced through the transformer are rectified, filtered and regulated. A very common 8 ohm audio impedance matching transformer can be used for the transformer. Published in EDN, Feb. 17, 1992

Click on Drawing Below to view PDF version of Schematic

Low Power AC/DC Power Supply designed by David A. Johnson, P.E. (June 9, 2000)

    AC to DC Converters

Master Schematic Category List - David A. Johnson, P.E.
 

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