[alex5908]

Hello everybody,
I have 4 different types of 2.5mm female to 3.5mm male audio adaptors but they all have bad contacts now. I'd like to DIY adaptors. I know the pin arrangement for 3.5mm unbalanced male (3pin) jack but can't find 2.5mm balanced 4pin connector pin arrangement. I can't make it out with the available adaptors as it's impossible to disassemble them. Google does not help either. Could anybody help with the pin arrangement for 2.5mm 4 pin balanced female connector?
The adaptor will look like this

 

[tomb]

Hello everybody,
I have 4 different types of 2.5mm female to 3.5mm male audio adaptors but they all have bad contacts now. I'd like to DIY adaptors. I know the pin arrangement for 3.5mm male (3pin) jack but can't find 2.5mm 4pin connector pin arrangement. I can't make it out with the available adaptors as it's impossible to disassemble them. Google does not help either. Could anybody help with the pin arrangement for 2.5mm 4 pin balanced female connector?
The adaptor will look like this

Google seemed to work quite well for me.

Look at this:

or this:

It appears that the 2.5mm TRRS does not use a separate Ground connection.

If I interpret what you are intending correctly, simply connect the R- and R+ together for the Ring connection on the 3.5mm plug and L+/L- for the Tip on the 3.5mm plug. The Sleeve (G) would remain unconnected (or connect it to the braid/shield if you're using a shielded cable). You should be able to see which leads are which, with the tabs inside the female connector. If you truly can't open up the female connector, you're never going to be able to make an adapter anyway.

 

[alex5908]

Hi,
thanks for the response.
My problem is NOT male unbalanced 3.5mm jack BUT female balanced 2.5mm connector pin arrangement. I was able to find pin arrangement for male jacks but absolutely nothing for a female socket. I am just shocked. They sell the adaptors but do not share the pin arrangement. It's a kind of weird, huh?

P.S.
This is strange but I posted this question in different forums and in different languages. All I get everywhere is the same scheme for a balanced jack. What I need is the pin connector arrangement for 2.5mm female balanced socket. Am I asking the question in the wrong way? If I am, could anybody correct me as I can't think of anything else but the way I've already explained it.

 

[OspreyAndy]

Hi,
thanks for the response.
My problem is NOT male unbalanced 3.5mm jack BUT female balanced 2.5mm connector pin arrangement. I was able to find pin arrangement for male jacks but absolutely nothing for a female socket. I am just shocked. They sell the adaptors but do not share the pin arrangement. It's a kind of weird, huh?

P.S.
This is strange but I posted this question in different forums and in different languages. All I get everywhere is the same scheme for a balanced jack. What I need is the pin connector arrangement for 2.5mm female balanced socket. Am I asking the question in the wrong way? If I am, could anybody correct me as I can't think of anything else but the way I've already explained it.

Any 4 pin capable 2.5mm female will work. You may not find the diagram but if you have it in your hand you just need to plug an existing Male counterpart, and do connection test using Multimeter beeper to see which pins on the Female responds to which pole on the Male side. I do this all the time for unfamiliar connectors. And you can find lots of 2.5mm female in Aliexpress:
https://www.aliexpress.com/item/329...earchweb0_0,searchweb201602_,searchweb201603_

 

[OspreyAndy]

Actually searching further in AliExpress I came across this one: Female 4 Pins

 

[alex5908]

Actually searching further in AliExpress I came across this one: Female 4 Pins

Thank you very much. That's what I've been looking for! How would you solder/connect a wire to "R-" pole? Seems like it does not have a joint for soldering.

 

[alex5908]

plug an existing Male counterpart, and do connection test using Multimeter beeper to see which pins on the Female responds to which pole on the Male side.

Thanks. It makes sense. I appreciate the link for 2.5mm female too. I've ordered them from https://www.aliexpress.com/item/32895805301.html

 

[OspreyAndy]

Thanks. It makes sense. I appreciate the link for 2.5mm female too. I've ordered them from https://www.aliexpress.com/item/32895805301.html

My pleasure, I ordered them as well haha. In the process of re-terminating all my stereos to all Balanced setup

 

[alex5908]

How would you solder/connect a wire to "R-" pole? Seems like it does not have a joint for soldering.

 

[OspreyAndy]

How would you solder/connect a wire to "R-" pole? Seems like it does not have a joint for soldering.

You see the soft bend? you solder it there. It's more visible from side view

 

[alex5908]

You see the soft bend? you solder it there. It's more visible from side view

You see (actually), there are three poles - 1, 2 and 3. Numbering 19 does not have anything for soldering.

 

[OspreyAndy]

You see (actually), there are three poles - 1, 2 and 3. Numbering 19 does not have anything for soldering.

The outer shell is actually the 4th conductor as with all 2.5mm plugs and sockets for balanced application. If you do a multimeter connection test you will see what I meant. That unmarked shell connects to the 4th section for R-

 

[alex5908]

That unmarked shell connects to the 4th section for R-

Thanks.
I am going to buy a 2.5mm balanced male 4 pole jack too. Do you have a reputable seller at aliexpress?

 

[OspreyAndy]

Thanks. I am going to buy 2.5mm balanced male jack too. Do you have a reputable seller at aliexpress?

On Aliexpress look for this seller, I use their plugs and they are superb. And yes they are reputable seller

 

[tomb]

Hi,
thanks for the response.
My problem is NOT male unbalanced 3.5mm jack BUT female balanced 2.5mm connector pin arrangement. I was able to find pin arrangement for male jacks but absolutely nothing for a female socket. I am just shocked. They sell the adaptors but do not share the pin arrangement. It's a kind of weird, huh?

P.S.
This is strange but I posted this question in different forums and in different languages. All I get everywhere is the same scheme for a balanced jack. What I need is the pin connector arrangement for 2.5mm female balanced socket. Am I asking the question in the wrong way? If I am, could anybody correct me as I can't think of anything else but the way I've already explained it.

You've finally got your answer, but two things:

1. A female 4-pin connector has to absolutely match a corresponding 4-pin plug.
2. A little deduction on your part should've been obvious. If you know the 4-pin plug, you can easily determine the 4-pin female, by plugging it in and checking continuity with the wire leads connected to the plug.

As I said, you got your answer, but a little reasoning on your part next time might be helpful.