This mini audio compressor circuit use only one active component T1. The audio signal goes thru C1, R1, D1, C2, R3. Still a part of audio signal charge the D3/D4 detector and creates a control voltage ...
A very simple audio compressor built with SSM2165 IC. There is no much explication about this compressor circuit schematic, just pay attention at capacitors voltage. The C8 value depends of your ...