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I have a audio interface + mixer that takes input from my microphone (mic level balanced) and my instrument (line level stereo). I want to build an arduino controlled mute button for those, so that I can use my keyboard to toggle the inputs on and off (can't do that via software because they are mixed beforehand).

The idea is that I can build some sort of device to stay between the inputs and the mixer and is attached to my pc via USB.

I know I can use serial communication for the software, but what kind of relays should I get? I don't want any additional noise in the system.

  • Maybe you could use a grounded shunt to "ground mute" the audio signal using a FET or BJT? As for relay, I'm not an audio geek but I don't see why a regular relay would add noise to the signal, so my guess is it should be fine and cheap. – cyberponk Feb 5 '17 at 20:03
  • @cyberponk I think the issue with regular relays is that the electromagnet will mess with the audio signal – n1xx1 Feb 6 '17 at 2:44
  • A relay uses DC, so it probably won´t disturb the audio signal as there is no induced current. But you could use a normally closed relay pin of a regular relay, so you only need to power it when you are muting. – cyberponk Feb 6 '17 at 3:53

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