audio stereo switch circuit diagram

Stereo Audio Switch Circuit

This stereo audio switch circuit allows that with only one switch to select one of the four stereo channels. The internal switching is made posible with CMOS components.

Each switch input includes a voltage divider to allow the switch to work in the linear zone of the characteristics, this ensures low audio signal distorsions.

Through the stereo switch circuit will flow a 1 mA current intensity at 5V. This voltage can be increased up to 15V.

Schematic of the Stereo audio switch circuit

audio stereo switch circuit diagram

Audio stereo switch ICs

  • N1 … N4 = IC1 = 4001
  • FF1, FF2 = IC2 = 4013
  • IC3 = IC4 = 4066


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  • auddocyahoo-com

    Microcontrollers are not the solution to everything. This is a mistaken trend that creates unreliable complexity where none existed. Simple chip count when the chips costs pennies doesn’t really matter too much, as it does not include the cost of writing code, debugging, fixing, rewriting and test, etc., etc.. Good code doesn’t appear out of thin air and has a very definite cost. Nothing has wasted more time in most technical people’s lives than shitty code, if you think about it. Once hardware chip logic works as designed, nothing changes. Again, this is just my opinion. I have had computers since they cost as much as a used car, so…some of this rant is completely justified…haha.

    • diggy_dude

      Whatever you’re trying to design should be child’s play for you then.

      If you’re waiting for help from the OP, bear in mind that I asked a question here in February 2014, and nobody ever replied to this thread before you came along. I’m unsubscribing now. Good luck!

  • auddocyahoo-com

    Sorry, no can do. Arduino stuff has no business being in any pro product IMHO. It’s strictly hobby. I prefer to use hardware logic as it doesn’t contain dodgy software. I thought someone might have a quick bit of advice about sequencing the flip/flops. Thank you very much though, for your input.

    • diggy_dude

      No problem. I still don’t see why you can’t use a microcontroller. Engineers who design pro products try to reduce the parts count as much as possible to lower production costs. One MCU vs. several discrete CMOS logic ICs. And you’re still going to need to provide current drivers for the motors either way. I’m probably saying things you already know since you’re a pro product designer though.

  • auddocyahoo-com

    I should have added, to clarify, that yes each button push will make one move or shift only.

  • auddocyahoo-com

    Thanks for the response. I meant two separate SPST switches. One switch for up (1-6) , one for down (6-1), (one to GND, one to B+?) both through six steps, very similar to the schematic shown, with six 4066’s doing the actual switching business on the output side (a voltage divider) and as shown, 4013 flip flops followed by 4001 inverters to perform the sequencing in the front end, do most of what I need except in only one direction. The front end, having two directions, I imagine would be a variation on this with the carry-over input being fed to the last or first flip/flop. I’m just not sure how to trigger the F/F’s and to create a “down “sequence through the F/F’s with an individual switch. I have even seen this switch function on clotheswashers/ pro-audio gear/ test equipment to step through various front panel settings.

    • diggy_dude

      You’re going to need a transistor or some other kind of current driver for each motor in any case, as the digital logic can’t provide enough current to drive them. I’d suggest getting a Arduino Nano and a few motor driver boards. The whole setup (minus the motors) can be had for under $10 on Ebay. And it can be reprogrammed again and again to do a lot more than the single operation you described, without building a lot of complicated circuitry.

  • auddocyahoo-com

    I want to use this stereo audio switch circuit as the basis for a 6 step (o-10V) motor control with single up AND down buttons. Any ideas on how to rearrange/ add to the flip flops/ OR gates to get 6 sequential and independent control lines? Any ideas on how to make it go down as well? I assume the existing design goes up only? is there a default max and startup position in the original design. I haven’t proto-typed this yet, so please forgive any stupid questions.

  • diggy_dude

    To reduce pops when switching, you can add a voltage divider to the outputs also. This will set the inputs and outputs at the same DC potential.

    Question: If you apply a higher bias voltage to the input voltage dividers, e.g. 15V, will the control pins still operate at 5V?

  • ben salah fatma


  • Sivanand

    Add LED’s at the output of 4001 via via 470 Ohms to ground.

  • Michael

    If I wanted to add 4 leds to indicate which line is selected where would be the best place to place them?

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