Can You Convert a 2.5mm Phone Jack to Dual 3.5mm Jacks?

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Converting a 2.5mm phone jack to dual 3.5mm jacks presents challenges due to the different configurations of connectors. The original headset has a single 2.5mm jack for both microphone and speaker, while the new headset requires separate 3.5mm jacks for each function. A simple Y-connector won't work, as it would mix the audio signals. The discussion suggests that a custom solution, such as soldering the old 2.5mm connector to the new headset's wires, may be necessary. Additionally, the presence of three contacts on the 3.5mm jacks raises questions about their functionality, possibly indicating features like noise cancellation.
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My cordless phone (No not a cell phone, this is a landline. They still exist, you young whippersnappers.) worked with a head set thus:
http://www.maxiaids.com/ProdImages/9700750.jpg
which has a 2.5mm jack. (It looks like a stereo jack i.e. three contacts but of course, it won't be stereo, it will be speaker and mic)

I wanted a smaller, lighter headset so I bought something like this:
419083H1JVL._SL500_AA280_.jpg

Problem is, it has two jacks (one for speaker, one for mic, colour-coded pink and green) and they are 3.5mm (and also three contacts).

I don't have a problem converting from 3.5 to 2.5, my difficulty is converting from single connector to this double connector. Clearly I can't simply use a Y-connector, since all that will do is feed the speaker and mic lines into each other.

Is there an adapter like what I'm looking for? What can I do?
 
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They didn't sell a headset compatible with your phone?
 
Chop the 2.5mm 3way off the old headset and solder it to the wires on the new headset?
 
the new headset is for a PC. On most sound cards, the inputs are also colour coded (pink and green) for mic and head phone 3.5mm jacks. This headset, as far as I can tell, was not intended to be used with a landline telephone. Using an adapter won't cut it I don't think. Still got the receipt? :wink:
 
redargon said:
This headset, as far as I can tell, was not intended to be used with a landline telephone. Using an adapter won't cut it I don't think. Still got the receipt? :wink:
I don't see why not, the microphone is going to be a standard electret and the headphones are all the same.

ps. the 2.5mm plug is normally microphone on the tip, then headphone then ground.

http://ca.geocities.com/mstudi@rogers.com/retro.html
 
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They didn't sell a headset compatible with your phone?
They do but not the type I wanted. I was optimistic about thinking it would be a simple matter of finding the right adapter.

mgb_phys said:
I don't see why not, the microphone is going to be a standard electret and the headphones are all the same.

ps. the 2.5mm plug is normally microphone on the tip, then headphone then ground.

http://ca.geocities.com/mstudi@rogers.com/retro.html

Thank you. That is exactly what I needed. (Failing finding a pre-made store-bought one that is...)

OK, only one issue left. The green/pink connectors are also 3 contacts, which means I have one contact each too many. Why would a mic connector have three contacts? And why would a single earpiece have three contacts?
 
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DaveC426913 said:
Why would a mic connector have three contacts? And why would a single earpiece have three contacts?
Either there are two microphones - one facing toward you and one away so it can do noise cancellation - OR they used stereo plugs because they are more common and cheaper.
 

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