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A classical design of an audio signal mixer circuit constructed with a few electronics
components is presented in above schematic. The VR1 and VR2 potentiometers are used to
adjust the proportion of the corresponding audio signal in output while the VR3 potentiometer
is used to control the balance between two inputs: Input1 and Input2.
You can connect a dynamic microphone to the Input1 and a music to the Input2, then adjust the
VR1, VR2 and VR3 potentiometers for obtaining a good mixed audio signal from the
circuit output. The VR4 potentiometer is an optional volume control for output audio signal.
Ask your question about this circuit in the forum.