Compressor Circuit with 570/571 Compandor IC circuit provide high gain for low amplitude input and provide
low gain for high amplitude input. This action, in effect, produce a
nearly constant amplitude even though the input has very high dynamic
range (very high amplitude variation from time to time). The action of
compression like this is needed in some situation, such as in maximizing
modulation depth in broadcasting, or sustaining electric guitar signal
which has very high variation between the plucking time and fading out.
The following circuit has complementary 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).
Compressor Circuit with 570/571
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