FET Audio Mixer


This simple circuit mixes two or more channels into one channel (eg.
stereo into mono). The circuit can mix as many or as few channels as you
like and consumes very little power. The mixer is shown with two
inputs, but you can add as many as you want by just duplicating the
“sections” which are clearly visible on the schematic.

Schematic

This is the schematic of the Mixer

Parts

Part
Total Qty.
Description
Substitutions
R1, R3 2 10K Pot
R2, R4 2 100K 1/4 W Resistor
R5 1 6.8K 1/4 W Resistor
C1, C2, C3 3 0.1uF Capacitor
Q1 1 2N3819 Junction FET
MISC 1 Wire, Shielded (Metal) Case, Phono Or Other Plug For Output

Notes

  1. As many or as few channels as are required can be added to
    the mixer. Do this by just duplicating the input “sections” which are
    shown on the schematic.
  2. A shielded case is probably needed to reduce hum and help stop oscillations.
  3. The circuit can be powered by a single 9 volt battery.

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