HUM_FREE_CASSETTE_RECORDER_SUPPLY

Published:2009/7/6 3:08:00 Author:May | From:SeekIC

Designed for tape recorder feeding into AF amplifier, to permit operation of recorder from power supply of amplifier without having hum due to positive feedback through shared ground connection. Circuit provides up to 150 mA at 7.5 V from supply ranging from 12 to 24 V. Transistors are connected as constant-currentsource in series with constant-voltage sink.Use three39-ohm resistors in parallel as 13-ohm resistor.-G. Hibbert, Avoiding Power Supply Hum, Wireless World, Oct. 1973, p 515.



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