A Simple Audio Compressor/Limiter

Jamie C. Anderson


Frequently, when microphones are used to reinforce stage performances, sudden rises in volume overdrive audio equipment causing both signal distortion and audience discomfort. In an instance such as this, a compressor/limiter may be used to control the output signal level, thereby protecting amplifiers, speakers, and ears. This article details a simple circuit that provides quality audio compression/limiting at low cost.


An audio compressor is a device that attenuates a signal once it reaches a set threshold voltage (Vth), in effect turning the gain down automatically when the input signal gets too large. How much a compressor attenuates a signal is defined by ...

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