TEST_TONES

Published:2009/7/5 20:50:00 Author:May | From:SeekIC

Provides preset frequencies of 400.1000.2125. and 2975 Hz Circuit consists of RC phase-shift oscillator driving Darlington emitter-follower that provides high-impedance load for osciIlator and stable 600- ohm output impedance．-s Kelly. A Simple Audio Test Oscillator.CQ1 Oct． 1970. p 50.and 90.



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