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

Master Category List - Dave's Circuits
 Last Updated on: Monday, August 18, 2008 04:18 PM


    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

Circuit 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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