One transistor audio mixer (2N3563)

  
This circuit mixer has an internal amplification with 2N3563 transistor. The two input signals can be independently controlled by VRI and VR2. The VR3 balance control is used to remove a signal while the other melted.

One transistor audio mixer (2N3563) - img1

The transistor provides gain and level of combined output signal is controlled by VR4.




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