Ton Giesberts
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Compressor for Electret Micro-phone

Compressor for Electret Micro-phone
The ‘FM Remote Control Receiver’ has a connector where an analogue output is made available. To make a simple intercom or P.A. system the associated transmitter needs a microphone pre-amplifier that outputs a signal at the correct level. And that is exactly the function of this circuit. Actually, this design is adapted from a circuit published last year (‘AM Modulator for Intercom’). A few things have been changed so that it can work with the 5 V supply from the transmitter module.
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