Alc (Automatic Level Control) Circuit

The rectifier input is tied to the input. This makes gain inversely proportional to input level so that a 20-dB drop in input level will produce a 20-dB increase in gain. The output will remain fixed at a constant level. The circuit will maintain an output level of 1 dB for an input range of +14 to -43 dB at 1 kHz.
Alc (Automatic Level Control) Circuit - schematic

Additional external components will allow the output-level to be adjusted.

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