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241 posts

Master Geek
+1 received by user: 54


Topic # 114513 22-Feb-2013 09:29 Send private message

Any and all advice on the below scheme appreciated

I have a Samsung Galaxy S2.  I want to hack into the headphone and microphone leads to be able to contrive a hands free set up via my car audio.  The phone is normally in a cradle and out-putting music to the head unit via a lead between the 3.5mm sockets on the phone and head unit.  I noticed when I get a call, the phone stops playing music.

I would ideally wire the headphone leads to a 3.5mm stereo plug, which will plug into the head unit and connect the micro phone lead to a micro-phone for a defunct Motorola hands-free kit, that is still installed in the car.  I would have to connect a 3.5mm plug or socket to the microphone lead, but I can do this bit myself.

I am a little worried the Motorola microphone will have more impedance or whatever than the tiny unit built into the GS2 headphone set.

This may seem like a roundabout route, but I have tried a few alternatives already ...

I started off trying to use the phone's handsfree function and inbuilt microphone.  This doesn't work, no-one can hear me.

I tried a mate's bluetooth kit that clips onto to the visor.  Ths worked well but Bluetooth drains the phone battery very quickly, and the cradle doesn't allow me to connect a charger .... hence the idea I am seeking advice on.

Has any one seen a set of leads that will allow this or can anyone tell me of an outfit that could wire this up for me?  I am not good enough to do the soldering myself.




Mike

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1246 posts

Uber Geek
+1 received by user: 98


  Reply # 767448 22-Feb-2013 09:58 Send private message

Would be keen to hear about this as well. I briefly looked into it a few months ago and couldn't find a nice off the shelf solution, just needs to be a break out adaptor 3.5mm to 2 x 3.5mm sockets, matching impedance of the mic should not be too much of an issue

985 posts

Ultimate Geek
+1 received by user: 35

Subscriber

  Reply # 767453 22-Feb-2013 10:12 Send private message

What sort of headunit do you have?
Also, what are the inputs assume mic 3.5mm socket?

I have a pioneer headunit with bluetooth built in for hands free (has its own mic you can cable to anywhere on the dash or trim....and its so much eaiser ...no wires, no cradles! The headunit also has front USB port for all things USB...inc charging the phone.

Do you really want to have to fumble around and turn off the audio each time you want to make a call / always having to turn down the audio because you think your phone is ringing / need to talk to someone calling?

Sorry if I havent understood your first post.



2747 posts

Uber Geek
+1 received by user: 423


  Reply # 767460 22-Feb-2013 10:17 Send private message

Here's the pinout for the headset connector.

http://pinoutsguide.com/HeadsetsHeadphones/samsung_i9100_headset_pinout.shtml

Can you solder up a breakout lead?

You can get the plugs here http://www.jaycar.co.nz/productView.asp?ID=PP0138&form=CAT2&SUBCATID=990#1

2913 posts

Uber Geek
+1 received by user: 34

Trusted

  Reply # 767848 22-Feb-2013 18:59 Send private message

Any condencer mic will work, that is what they all use. This is also where the ~ 1k to 2k Ohm comes from. If the old hands free kit has an amplifier, then that will not work.

There are generic adapters on eBay, just look for one that is shipped from UK or US, else it will take at least a month to deliver. (UK is better than US.)

You can also use a video camera AV lead (often available at $2 shops). They use the same connector.
http://pinouts.ru/Home/av_jack_pinout.shtml

EDIT: Look like Sony video camera AV leads have the same GND connection.




You can never have enough Volvos!




241 posts

Master Geek
+1 received by user: 54


  Reply # 767921 22-Feb-2013 21:22 Send private message

thanks for the replies folks.

Gooseybhai I have a Sony tunetray headunit, no Bluetooth. I am using the phone as the music player via the 3.5mm input jack on the head unit. Because I am playing music from the phone, if I make or receive a call the audio automatically mutes.

Niel, how would I tell if the old handsfree has a microphone amplifier?  It was a Motorola T605 if that tells you anything?




Mike

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