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
Wednesday, May 13, 2009 7:00:50 AM
Its a simple circiut. We can make a couple of this and have our own audio mixer stadium conferences... We can also practice our music instruments with the help of this..... Thank you very much...... jonjongregorio hobbiyist philippines
august
FET Audio Mixer
Sunday, March 15, 2009 8:19:40 PM
Mike- I plan on building one of these as a stereo to mono device, so what I am going to do to eliminate the pots is to replace R1 and R3 w/ fixed 10k resistors, the connect the 100k resistors to the junction of the 10k's and the 0.1uF caps. It's like having the volume pots stuck on full. I have enough level controls on all the other equipment that more volume pots would just get in my way. Hope this helps!
Mike
FET Audio Mixer
Friday, January 23, 2009 11:04:13 AM
Is there any way to not use potentiometers? I'm looking to make two of these: one with no potentiometers at all (completely even blend) and one with only one potentiometer and a switch on that channel (i.e., one main input and a second input that can be turned on or off and volume adjusted).
anonymous
FET Audio Mixer
Saturday, December 20, 2008 6:00:53 PM
is it possible to add another POT for the master volume control? and if so, where in the circuit would i place that?
jin
FET Audio Mixer
Monday, December 08, 2008 3:18:34 AM
hi i'll try to audio mixer. but I could't find JFET in my city (seuol.korea). So I changed the other components. R 2,4:33(ohrm),R1,3 B50(K ohrm) C1,2,3 : 104J100N Transister : K193 K57 Same voltage. but I don't know what type use R5. I can't find R5. plz respose this question.plz~~~~
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.
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