_12V_TO__8_V

Published:2009/6/30 2:14:00 Author:May | From:SeekIC

NE555 timer connected as 20-kHz oscillator drives pair of D44H4 transistors through 7437 quad two-input NAND buffer to produce full 200 mA of regulated output for each polarity. Circuit uses push-pull inverter technique to generate AC for driving transformer constructed by rewinding 88-mH toroid to have 40 turns No, 20 center-tapped for primary and 350 turns No. 26 center-tapped for secondary.—S, Ciarcia, Build a 5 W DC to DC Converter, BYTE, Oct. 1978, p 22, 24 26, 28, and 30-31.



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