3.5mm headset jack schematic?

jsmith · 04-11-06, 11:05 AM

Hi,
I'm trying to modify a standard PC headset to connect it to my x51v. Does anyone know what is the mapping of the individual rings on 3.5mm 4c connector to ground/mic/chan1/chan2?

Or, could a good soul owning one of those PPC Techs adapters and an ammeter quickly measure it :)?

Thanks!

04-11-06, 01:22 PM

http://www.aximsite.com/boards/showt...ghlight=pinout

;) now help me where did you manage to find one of those 4 position 3.5mm connectors?! I can't find them anywhere

SadiaV · 04-11-06, 06:49 PM

Hello,
I tried this and it works for me. I guess You are talking about this thing;)

masadler · 04-11-06, 10:14 PM

They tied the Mic & Audio ground together?!?!?

Don't Panic! · 04-11-06, 10:44 PM

Welcome to Aximsite! jsmith.

Doesn't the standard PC headset (Stereo headphones and mike) have 2 plugs at the end?

Just curious I've been looking for a microphone/headphone solution myself. All the PC gear I checked out had 2 plugs.

jsmith · 04-13-06, 12:34 AM

Originally Posted by SadiaV

Hello,
I tried this and it works for me. I guess You are talking about this thing;)

Thanks! I've also found this page, describing the procedure for the iPaq, and the pinout seems to be the same.

awdark:
I found some here. There are a few other places selling them - try googling for "3.5mm 4C connector" or "3.5mm 4-conductor", etc...

don't panic:
Yes, that's why I needed the pinout to mod a regular headset into an "Axim-compatible" frankenheadset :-).

bigbop · 04-13-06, 01:02 PM

Originally Posted by jsmith

Thanks! I've also found this page, describing the procedure for the iPaq, and the pinout seems to be the same.

awdark:
I found some here. There are a few other places selling them - try googling for "3.5mm 4C connector" or "3.5mm 4-conductor", etc...

don't panic:
Yes, that's why I needed the pinout to mod a regular headset into an "Axim-compatible" frankenheadset :-).

Perfect! Since HTC designed both the Axim and the Ipaq, that seems logical.

Maybe Don't Panic can request the author of this page http://web.it.kth.se/~maguire/iPAQ-p...o-adapter.html for permission to post it in the Aximsite reference area - I've attached the re-done page and acknowledged its source.

And $3.45 for the plastic conector is pure ripoff!!. These are going for $1 ea in Toronto (Supreme Electronics on Queen St West)

Bill_Todd · 04-14-06, 08:49 AM

Originally Posted by awdark

http://www.aximsite.com/boards/showt...ghlight=pinout

;) now help me where did you manage to find one of those 4 position 3.5mm connectors?! I can't find them anywhere

For those in the UK:

http://cpc.farnell.com/jsp/endecaSea...=AV10259&N=411

viragon · 05-12-06, 07:34 PM

I built my own adapter following the professor Macguire's scheme.
It works great both for listening and for recording when the X50v is running on the internal battery

.
Unfortunately, if I try to use it with the X50v connected to the wall adapter, as well as with the craddle, the recording is strongly disturbed by heavy interference noise:realmad:

.
Any one experienced the same problem with the home-made adapter and/or with the one for sale on the web?
Any idea on how to solve this issue (maybe a rectifying filter after the wall transformer?:scratch_h ).
P.S.: I used shielded wires for both connections (same as prof. Macguire).

masadler · 05-13-06, 10:37 AM

Viragon, I believe the shielding will be less effective if there is no grounding at either end. Floating shields tend to act like an EM-tunnel. If the internal ground is passed to the power adapter then you probably cant prevent the interference since it is on the AX's ground source. There are cleaners for wall outlets and they may help alot. Another source could be PC equipment near by or something on the wall outlet's circuit (other noisy equipment).

viragon · 05-13-06, 03:48 PM

Thank you Masadler for your help.

I made the same question I posted yesterday on this site, directly to prof. Macguire as well and got the following answer:

"Unfrotunately I do know the likely cause for this as I experienced in
an earlier system which a collegaue and I built. The difficulty is
that the noise from power supply is getting to the power for the
microphone and the AGC and amplifier for the audio section are
amplifying this noise. The solution is to use a battery powered
microphone if the power to the microphone can be turned off. If the
Axim x50v is using a similar circuit to the iPAQ, then this should
occur when it senses that microphone is externally powered. If not,
then you either have to flip the bit on the CODEC to turn the power
off or you can disconnect the lead to the microphone's ring 1 (which
is where the microhone would get external power) and replace this with
a connection between the ground and this ring of an external battery.
Another approach is to run the PDA from a large external battery
(for example for the iPAQ - using the power connection via the
serial/USB connector to provide external DC power)."

I think this could be of help for anyone else in the same situation.

I'll give a try to this methods and will keep you posted.

Thanks

viragon · 05-31-06, 03:21 AM

After a while

, i finally had the time to try and solve the noise issue .... and even wrote a tutorial about how to build an adapter cable for our Axim .... .
Here is the link to the guide published on x50v.it

HTML Code:

http://www.x50v.it/content/view/1159/69/

hoping this will be of help to someone.

KarThiK_ · 05-31-06, 04:14 AM

gr8 tutorial viragon :D

alzellogin · 05-31-06, 04:42 AM

i faound this:
maybe helps...there are nice pics...

http://www.x50v.it/content/view/1159/69/

viragon · 05-31-06, 06:01 AM

Originally Posted by alzellogin

i faound this:
maybe helps...there are nice pics...

http://www.x50v.it/content/view/1159/69/

Alzellogin, infact this is the tutorial I wrote I was referring to :) ..