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I have a seldom used piece of computer hardware I'd like to connect a gaming headset to. The headset has two 3.5mm plugs (mic and sound) like this:
alt text

The jack I need to plug into is a 2.5mm monaural (don't ask me why--I know it sounds goofy but it's for someone else who's very picky). I googled a few different ways but I could only find splitters such as this for going from 2 x 3.5mm to 1 3.5mm. If I could find one that could combine it properly to 1 3.5mm, I could then find a 3.5mm to 2.5mm adapter. I know I could probably vivisect and work something out, but I need it to be very clean. Any ideas?

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Ok, I have completely revised my answer based on the comment discussions.

I can't find an off-the shelf lead for this so it may be a soldering job.

  • The L-R headphone wires can be joined together to give a mono headset - H in diagram below.
  • The mic may or may not be stereo, but only one wire should be used - M1 OR M2 in diagram below.

You will need to work out which of A or B on the 2.5mm TRS plug connects to the headset output and mic input on your kit, then wire H and Mn to them accordingly. The screen/ground wires from the sockets are joined together and wired to the ground connector (sleeve) on the 2.5mm plug.

To make this up, I'd buy a 3.5mm stereo socket to socket lead and a 2.5mm stereo jack (TRS) plug. Cut the lead in half. The two wires in the lead will probably be a red/white or red/black pair + screen

Hope this makes sense. Have fun!

Wiring diagram

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@Linker3000: No, I need both listening and mic. 3 contact 2.5mm. Mic and mono sound. Sortof like cell phone headsets: – Flotsam N. Jetsam Jan 7 '11 at 17:11
@Flotsam N. Jetsam Do you need listening and mic at the same time? – AndrejaKo Jan 7 '11 at 17:35
OK, the confusing bit was mentioning 2.5mm 'monoaural' - Let's see what I can dig up... – Linker3000 Jan 7 '11 at 17:35
@AdrejaKo: Yes Indeed. – Flotsam N. Jetsam Jan 7 '11 at 17:35
Tons of Googling later and I reckon you will be doing some soldering! Are you up to that? – Linker3000 Jan 7 '11 at 17:46

You can try to make it manually. You`ll need to cut off those 2 plugs & then solder wires to the 2.5mm jack.

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Not really helpful - no wiring info provided. – Linker3000 Jan 7 '11 at 17:07
I mentioned not wanting to cut in the question. – Flotsam N. Jetsam Jan 7 '11 at 17:17
up vote 1 down vote accepted

I found the answer Here:

Here's what it looks like: alt text

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