If you are looking for a circuit that can mix two audio signals and produce a combined signal at the output, then the 2-transistor mixer circuit shown above will probably do the job for you!
This circuit not only mixes and blends two audio signals but also boosts them to a higher level so that it can easily be used to feed a power amplifier.
It has a pair of audio inputs which are amplified by separate single transistor amplifiers configured as common emitter amplifiers. VR1 and VR2 allow the user to select how much signal can be passed through the two inputs so that the signals can be mixed appropriately.
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