Compressor circuit offer high gain for low amplitude input and supply low gain for high amplitude input. This activity, effective, develop a nearly steady amplitude even though the input has really high dynamic range (really high amplitude fluctuation from time to time). The accomplish of compression like this is called for in some situation, as in maximizing modulation depth in broadcasting, or sustaining electric guitar signal which has very high variation between the plucking time and fading out.  This circuit has reciprocal input/output characteristic and unity gain at 0.775 VRMS input. Voltage gain through compressor is square root of 0.7/Vin. Vin is average input voltage. This circuit  uses Signetics dual channel compandor IC.  570 has lower inherent distortion and higher supply voltage range (6-24 V) than 571 (6-18 V). (Source : freecircuitdiagram.com)

570 571 Compandor IC Compressor Circuit

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