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Originally Posted by AKAJohnDoe
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4-contacts? Really? I hadn't looked lately, but did not think that headphones had changed much since stereo was introduced in the 1950's with the 3-contact 1/4" phone plug. I would expect that Radio Shack would have the adapter in stock.
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Looking at the picture above, instead of Left, Right, Ground, you will have Left, Right, Mic, Ground.
I already built an adapter using the 4 circuit plug and it works fine.
Typically on a computer mic, it may have a stereo plug but the two circuits for L & R are usually connected, so you will need to make sure that you use a stereo jack for the mic and connect the L & R together.