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I want the normal path from a sound card to go to a speaker/internal mic, but when a headphones or mic (mic with PTT, hence 4-pole) is connected in a 3.5mm plug then I want to reroute there.

Ideally I want this for 3-pole and 4-pole 3.5mm through-hole PCB mount.

I think what I want is TRS and TRRS switched socket. But they seem to only have one path broken when a plug is inserted. Should I use relays to switch the 2-3 signal paths?

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The integrated switches are the easiest and most common way of switching off other audio paths. You can find 48 examples here.

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  • \$\begingroup\$ Thanks! I couldn't find any TRRS that switch off all three non-ground, but now that I think about it for my application that's actually fine. \$\endgroup\$
    – Thomas
    Commented Jul 8, 2020 at 14:15

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