sound system equipment Audio Mixer circuit diagram Using FET

This simple circuit mixes two or more channels into one channel (eg. stereo into mono).

Parts
R1, R3 10K Pot
R2, R4 100K 1/4 W Resistor
R5 6.8K 1/4 W Resistor
C1, C2, C3 0.1uF Capacitor
Q1 2N3819 Junction FET
MISC Wire, Shielded (Metal) Case, telephone Or Other Plug For Output