2 Channel Audio Mixer using Transistors

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This 2 channels audio
mixer is based on the 2n3904 transistors which forms 2 pre-amplifiers.
The first preamplifier of the audio mixer has a high gain and can be
used for microphone input, and the second one can be used to control the
input of the audio level. This two channel audio mixer require a power
supply with the output voltage between 9 to 12 volts . For the audio
signal you can use a CD player, mp3 player or other audio device and for
the microphone you can use a normal dynamic microphone.