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??? Audio Expansion Circuit ???

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Does anyone have a schematic for an audio expander that is not very complicated?
I found one once but it had more than 100 components...
Note: The Audio Expander is the opposite of the Audio Compressor.

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Guest Alun

A compandor is a compressor and expander in one Package.

A compressor is a non-linear amplifier that has a low gain at the higher parts of a signal and higher gain at low signal levels.

A compressor has a logarithmic response and an expander has an exponential response.

Hence an expander increases the dynamic range of a signal and a compreser reduces it.

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The professional wireless microphone systems I worked with use companders. The transmitters compressed the signal to raise its low-level parts well above the noise level, and the receivers expanded it back to normal dynamic range without noise. ;D

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