Audio Switch help

Discussion in 'General Electronics Chat' started by GuitarGuru76, Nov 2, 2012.

  1. GuitarGuru76

    Thread Starter New Member

    Oct 30, 2012
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    I am looking for help in designing a switch circuit. One momentary switch to cycle thru 4 switching stages. With LED indication. drawings attached to help illustrate. any suggestions for components would be great.
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    What power supply voltages do you have available?
     
  3. GuitarGuru76

    Thread Starter New Member

    Oct 30, 2012
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    What I have right now is a dual rail +6.4VDC -6.0VDC 200mA.
     
  4. liquidair

    Active Member

    Oct 1, 2009
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    I've done similar switching with a CD4017 chip. The MOM switch triggers the clock input with a positive pulse and the outputs go high from Q0 to Q9 in order. I assume you want it set so that if you are on LED 4 and hit the switch it will go back to 1, in which case you simply tie Q4 (output number 5) to the reset pin.

    I've only used this chip like this with DC control voltages for audio switching circuitry, which works well. What kind of signals are you trying to switch, guitar, preamp, tube amp?
     
  5. GuitarGuru76

    Thread Starter New Member

    Oct 30, 2012
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    Hi Ron, I am switching line level audio in a circuit. To be more exact. I am trying to replace old slider selector switches with this circuit.
     
  6. autotuner

    New Member

    Oct 2, 2012
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    A combination of the 4017 as described by liquidair and a 4066 quad bi-lateral switch for the actual audio maybe?
     
  7. crutschow

    Expert

    Mar 14, 2008
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    If you use the 4017 with the 4066 you would need to power them from the plus and minus voltages(+ to Vdd, - to Vss), not just the plus voltage to common. That way the AC audio signals that go plus and minus with respect to common can be properly transmitted by the 4066. In that configuration the logic signal levels will go from the plus to the minus voltage.
     
  8. GuitarGuru76

    Thread Starter New Member

    Oct 30, 2012
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    Maybe something like this?
     
  9. autotuner

    New Member

    Oct 2, 2012
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    Yup, something like that, and crutschow is quite correct about the offset pos and neg supply, but you already have that dual rail !
     
  10. crutschow

    Expert

    Mar 14, 2008
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    The schematic shows the ground as common. All the ground points need to be at the minus voltage rail instead, Edit: and with an increase of the LED resistor values.
     
  11. GuitarGuru76

    Thread Starter New Member

    Oct 30, 2012
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    Thanks guys. It has been a long time for me with schematics. getting back into it after 25 years. feel free to edit what I have. I look forward to the input.
     
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