FET Audio Mixer


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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, R3210K Pot
R2, R42100K 1/4 W Resistor
R516.8K 1/4 W Resistor
C1, C2, C330.1uF Capacitor
Q112N3819 Junction FET
MISC1Wire, 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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Comments

anonymous
FET Audio Mixer
Monday, August 04, 2008 10:52:23 AM
what part of this circuit I will place my tone control circuit?
jane
FET Audio Mixer
Wednesday, July 23, 2008 7:23:49 AM
please how can i build an audio mixer with 6 inputs and 2 outputs.
Tende I vo
mixer
Sunday, July 20, 2008 3:42:47 PM
Wnhat you people have done good, but some biginners liuke me do not know how to use the FET TRANSISTOR. So please if you people can send me some other schematics that dose not have FET i will be very happy . THANKS. I want to be a DJ using my own circuits.
computablemind
FET Audio Mixer
Thursday, May 01, 2008 12:45:38 AM
hello thanks for the circuit schematic. can anybody mention any other fet's that could be used instead of the 2n3819. in fact, anything about transistor equivalencies (specially for mixer purposes) is welcomed,thank you
Audioguru
FET Audio Mixer
Thursday, January 17, 2008 10:50:09 AM
This mixer attenuates the input levels. With 2 inputs the levels are half. With 4 inputs the levels are 1/4. With 8 inputs the levels are 1/8th etc.
anonymous
FET Audio Mixer
Sunday, October 21, 2007 12:31:22 PM
can anybody tell me more about the description of the circuit any one plz.... and yes i woul dalso like ot know that how are you goin to provide the input and output ? any specifications? any about the frequency ? amplitude (voltage) minimum or maximum requirements... anything any info.. plz tell me.. and kindly plz .. if any can guide me on my e-mail
anonymous
FET Audio Mixer
Wednesday, October 10, 2007 6:57:49 PM
please i need a very powerfull mixer with 8 channel and that have bass, treble, and volume control. thanksmfor your support.
anonymous
FET Audio Mixer
Monday, October 08, 2007 5:09:49 AM
I'd like to built this. does anyone have a circuit diagram for PC board or Veroboard layout? Thanks
anonymous
FET Audio Mixer
Wednesday, October 03, 2007 1:56:03 AM
I'm pretty new at this game-- what other transistors could be uses as a substitute for the 2N3819?
Watson A.Name
FET Audio Mixer
Sunday, September 09, 2007 4:10:34 AM
Oops! I forgot something. If the blocking caps are put between the wipers and resistors, then the Gate of the FET must have a 1 meg resistor to ground.
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