basic 3 input mic mixer circuit with the popular opamp 741 ICs.

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3 Channel Microphone Mixer Circuit with IC741 circuit is a basic 3 input mic mixer circuit with the popular opamp 741 ICs.
Two 741s are used here. U1, U2 are used as preamplifiers.
They produce a gain of around 40 dB to the individual input signals.
The U1 is wired as a summing amplifier to add the signals from three preamplifiers.
IC2 also gives a gain of around 5decibel to the final output signal.
Total gain of the system is around 45 dB.

Electronic Part List

  • R1, R2, R3 1K 1/4W Resistor
  • R4, R5, R6 10K Logarithmic Pot
  • R7 1Meg 1/4W Resistor
  • R8, R10 10K 1/4W Resistor
  • R9, R11 100K Linear Pot
  • C1, C2, C5, C6 0.1uF Ceramic Disc Capacitor
  • C3, C4 22nF Ceramic Disc Capacitor
  • U1, U2 741 Op Amp
  • J1, J2, J3 Input Jacks Of Your Choice


Note

R9 and R11 control bass and treble, respectively and R1-R3 are level controls. Because the circuit draws such low current, we using 2 X 9V batteries that can be used for a power supply. You should be build the mixer in a metal case will cut down on noise.

basic 3 input mic mixer circuit with the popular opamp 741 ICs.

S:electronicsuite.com


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