HIGH_ON_LOGIC_CONTROL

Published:2009/6/29 23:52:00 Author:May | From:SeekIC

Uses Signetics NE571 or NE570 analog compandor. When control tnput is high, CR1 is off and current developed by RGAIN flows into rectifier input, allowing audio to be amplified. Gain is unity (or other nominal value chosen by changing value of R3) for control inputs greater than 3 V. Switching is abrupt, with full attenuation below 1.5 V. Narrow transition width and nominal DC center of 1.8 V allow direct control from CMOS, rrL, DTL, or other positive logic. Supply voltage should be stable.-W. G. Jung, Gqin Control IC for Audio Signal Processing, Ham Radio, July 1977, p47-53.



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