3 Input mic mixer circuit

Posted on Feb 7, 2014

Here is a simple 3 input mic mixer circuit using the popular uA 741 ICs. Four 741s are used here. IC1, IC2, IC3 are used as preamplifiers. They produce a gain of around 40 decibel to the individual input signals. The IC4 is wired as a summing amplifier to add the signals from three preamplifiers. IC4 also gives a gain of around 5decibel to the final

3 Input mic mixer circuit
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output signal. Total gain of the system is around 45decibel.

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