Simple Microphone Mixer

  
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.
Simple Microphone Mixer - schematic

R1-R3 are level controls. R9 and R11 control bass and treble, respectively. Since the circuit draws such low current, two 9V batteries can be used for a power supply. Building the mixer in a metal case will cut down on noise.



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