Automatic Audio level control with NE570

Posted on Dec 31, 2012

The NE570 can be used to make a high performance compressor FTA, except that the rectifier is connected to the input. This makes gain inversely proportional to the input level so that a drop of 20 dB input level will produce an increase of 20 dB gain. The output remains at a constant level. As shown, the circuit will maintain an output level of ± 1 dB for an input range of + 14 to -43 dB at 1 kHz.

Automatic Audio level control with NE570 - image 1
Click here to download the full size of the above Image.

Additional external components allow the output level to resolve.

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