Pin out of the 2.5mm 4 way plug? 3310 3510 etc.

Hi,

Could someone please tell me the pin out of the 2.5mm 4way plug
commonly used for hands free on the 3310 3510 range of phones?

I have a hands free car adaptor which works rather well on on the
received audio (good clear audio volume), but it is entirely lacking
any audio from me, when I try to make a call. I have pulled the unit
apart and can't see a microphone inside at all, so my intention is to
try to fit one.

Incidentally, I have just bought a second one.... A rather cheap one
marked '4 in 1'. The audio volume on this was pathetic although the
audio in does seem to work. It uses the speaker as both a speaker and
microphone, although their is a microphone supplied and a socket marked
'mic' on the side to plug it in plus a socket on the front for a
earphone/mic to be plugged in.

On opening up this unit, I found the socket for the mic was just that,
a socket. The socket is not wired up to anything.... No wires, no where
on the PCB to connect the wires, even if there were any.

--
Regards,
Harry (M1BYT)...

Remove the 'NOSPAM' in my email address to reply.

Free Amateur Radio Courses:-
http://www.ukradioamateur.org

---

› See More: Pin out of the 2.5mm 4 way plug? 3310 3510 etc.

"Harry Bloomfield" <[email protected]> wrote in message news:[email protected]...
> Hi,
>
> Could someone please tell me the pin out of the 2.5mm 4way plug
> commonly used for hands free on the 3310 3510 range of phones?
>
> I have a hands free car adaptor which works rather well on on the
> received audio (good clear audio volume), but it is entirely lacking
> any audio from me, when I try to make a call. I have pulled the unit
> apart and can't see a microphone inside at all, so my intention is to
> try to fit one.
>
> Incidentally, I have just bought a second one.... A rather cheap one
> marked '4 in 1'. The audio volume on this was pathetic although the
> audio in does seem to work. It uses the speaker as both a speaker
> and microphone, although their is a microphone supplied and a
> socket marked 'mic' on the side to plug it in plus a socket on the
> front for a earphone/mic to be plugged in.
>
> On opening up this unit, I found the socket for the mic was just that,
> a socket. The socket is not wired up to anything.... No wires, no
> where on the PCB to connect the wires, even if there were any.
>
Take a look at these:
http://free-zg.hinet.hr/GoranJurkovic/nokia/

In article <[email protected]>, ldmnews1
@netassoc.net says...
| > On opening up this unit, I found the socket for the mic was just that,
| > a socket. The socket is not wired up to anything.... No wires, no
| > where on the PCB to connect the wires, even if there were any.
| >
| Take a look at these:
| http://free-zg.hinet.hr/GoranJurkovic/nokia/
|
|
|

Thanks, just what I was looking for ;-)


--
Regards,
Harry (M1BYT)...

Remove the 'NOSPAM' in my email address to reply.

Free Amateur Radio Courses:-
http://www.ukradioamateur.org