2,5mm to 2 x 3,5mm

[civixier]

Hi!
Im trying to make my own handsfree adapter,
but there is one thing i haven't figured out.

This is a drawing of the 2,5mm plug
.._____ _____
-I_I_I_|_|_|_/


Headphones
.._____ _____
-I_I_I_|_|_|_/ -> {Into cellphone}
1 2 - 3

1 = Left
2 = Right
3 = "Earthing" (Hey, I'm Swedish XD)

Now... How do I do the same thing with the
microphone part?

:confused::confused:

[l3v5y]

I believe the microphone is one of the four rings, and grounded with the others on the return...

[civixier]

Ah thx, that reduced the amount of possibilities :D

[krishan2207]

out of four one for mic, one for ground and two for left right speakers.and the attending switch is placed between mic's connections via diode.

[OSX]

|
|_|_|_|_> inside the phone jack
|1 2 3 4

1. Earth
2. Mic
3. Right
4. Left

the attending switch (as Krishan said), is connecting 1 + 2 before they reach the mic.

I'm using Sony-Ericcsson's W series cable with the original I-mate pipe phones, this way, I have the same pipe phones cable working on any multimedia Speakers. plus this cable seems to be really heavy-duty! although it's thin!