This electronic circuit is audio limiter compressor specifically designed to use with very low-cost electret desk microphones. Overcomes the heavy attack/decay problems with diode rectifier VOGAD circuits.
A TL074 IC was used with a dual supply of +/-5v Note the lack of rectifier diodes in the feedback loop, instead the circuit uses high gain BC848(smd BC108) This uses the full wave rectifier effect to give a non-linear compression level avoiding the worst of the 'pumping' normally noticed with discrete diodes. R38 sets the compression level/bias point to suit the hfe of the selected transistor. Note Q2 is a P channel Junction FET eg J176.
Source: http://www.g8ajn.tv/projects.htm
A TL074 IC was used with a dual supply of +/-5v Note the lack of rectifier diodes in the feedback loop, instead the circuit uses high gain BC848(smd BC108) This uses the full wave rectifier effect to give a non-linear compression level avoiding the worst of the 'pumping' normally noticed with discrete diodes. R38 sets the compression level/bias point to suit the hfe of the selected transistor. Note Q2 is a P channel Junction FET eg J176.
Source: http://www.g8ajn.tv/projects.htm
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