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DIY Headphone/Speaker switcher Answered

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Hi. I want a box where I can select whether I was the signal to go to either my headphones or my desktop speakers. I know I can just get a 3.5mm splitter cable, but I'd prefer to be able to switch of either one when it's not being used. To get around having to use several switches, I thought of this. If you think (like me) that it'll work, could you please let me know. Thanks, wbr

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guyfrom7up (author)2008-02-16

I think his diagram should work, current (signal) can't flow inless it's a closed circuit, which is it's own ground.

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matseng (author)guyfrom7up2008-02-16

No, it won't work. Unless both channels are isolated with output stage audio transformers or he's only listening to mono recordings (exactly the same in both channels) there will be a lot of sound. The proposed circuit will act as a thing that takes the difference of both channels and plays it thru both speakers. See my drawing (and fear my leet paint skillz :-).

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NachoMahma (author)2008-02-16

. I'd suggest getting a DPDT switch (vs your SPDT) and putting it on the "hot" (R & L) wires, then run from the switch to your drivers.

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WildBlueRhino (author)NachoMahma2008-02-16

Ok, thanks. I think I'll do that. Just out of curiosity though, do you think this could actually work this way?

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NachoMahma (author)WildBlueRhino2008-02-16

. It should work, but there is the potential for crosstalk and/or impedance mismatch if there is a stray ground path. If all you have handy is a SPDT, try it and see.

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