Microphone Mixer Circuit Schematic Diagram

This relatively simple mixer was designed for three dynamic microphones, but can be re-designed for more or less. Level and tone controls are available to tailor the sound to your needs. 
Circuit Diagram


Total Qty.


R1, R2, R331K 1/4W Resistor
R4, R5, R6310K Logarithmic Pot
R711Meg 1/4W Resistor
R8, R10210K 1/4W Resistor
R9, R112100K Linear Pot
C1, C2, C5, C640.1uF Ceramic Disc Capacitor
C3, C4222nF Ceramic Disc Capacitor
U1, U22741 Op Amp
J1, J2, J33Input Jacks Of Your Choice
MISC1Board, Wire, Knobs, IC Sockets

  1. Email Anatoly I. Shikhatov with questions, comments, etc.
  2. R1-R3 are level controls. R9 and R11 control bass and treble, respectively.
  3. Since the circuit draws such low current, two 9V batteries can be used for a power supply.
  4. Building the mixer in a metal case will cut down on noise.

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