Audio. - Here is Circuit Schematic Passive Dynamic Audio Compressor. This dynamic compressor with passive components reduces high signal to a lower, more constant signal. If you look at this compressor schematic, you’ll notice it has no power supply, the required power is obtain thru the output signal. If you respect the schematic values this audio compressor will output a constant 70mV when the input voltage is between 100mV and 10V.