2 Channel Audio Mixer electronic schematic

A very simple and easy audio mixer circuit can be build using few common electronic components  .  This audio mixer electronic circuit has two input channels  . The input signal can be independently controlled using  the R1 and R2 variable resistors   . The R3 variable resistor offers possibility to fade out one of the signal while the other signal is fading in  .  The gain of the mixer is provided by the 2N3563 NPN transistor .  The R4 variable resistor connected at the audio mixers output offer possibility to control the output signal volume .
This electronic audio mixer schematic  need  to be powered by a 9 volts DC power supply .