±15_V_FROM_12_V

Published:2009/6/30 2:46:00 Author:May | From:SeekIC

Steps up output of 12-V bat-tery to voltages required by PLL such as NE561. Uses 900-Hz sine-wave oscillator and LM380N AF amplifier to drive voicecoil side of standard 500-ohm to 3.2-ohm output transformer having bridge rectifier across center-tapped primary. With 10-mA loads, maximum ripple is 15 mV P-P. With receiver quiet, 900-Hz hum is audible, but is normally lost under background noise. Oscillator choke (about 700 mH) is 800 turns of No. 44 magnet wire in Ferroxcube 30 pot core.—R. Megirian, Build a Noise-Free Power Supply, 73 Magazine, Dec. 1977, p 208-209.



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