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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 |
