AUTOMATlC_LEVEL_CONTROL

Published:2009/6/30 1:48:00 Author:May | From:SeekIC

Uses Signetics NE570 or NE571 analog compandor to provide automatic level control for audio signal processing, to give constant high percentage modulation despite varying input levels. Optional resistor Rx varies threshold of level regulation. Widest range of gain control is obtained with Rx, open. When resistor value is Iowered, larger input signal is required for full output.Peak-level dipping with pair of reverse paralleled LEDs controls overshoots on speech by limiting RMS output to 2.2 V P-P. Ry regulates dipped amplitude.-W. G. Jung, Gain Control IC for Audio Signal Processing. Ham Radio, July 1977, p 47-53.



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