Please help me add earbuds to my 7 pin Autocom connector... - BMW Luxury Touring Community
 
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post #1 of 5 Old Sep 20th, 2007, 9:39 pm Thread Starter
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Please help me add earbuds to my 7 pin Autocom connector...

Hi all,

Bought a 7 Pin din male and female connector today so's I can add earbuds to my Autocom system.

I found the Autocom pin out diagram in the forum here, and now I need to know:

Earbuds use 3 wires - negative is common to left and right.

Autocom uses separate negatives, so it's four wire.

If I take the four to three, will I introduce any noise?

I don't want to pay $84 for two Autocom parts # 1187

Also, since your answering, can you add the $4 Rat-Shack Isolation Transformer to a stereo cable to solve any noise problems? If so, which wires?

If not, is there a stereo version you all use?

Thanks.

mike
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post #2 of 5 Old Sep 21st, 2007, 12:51 pm
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Mike,
You need a few more parts, but before I get in trouble from Autocom, their cable is excellent quality and worth the money. I have one and it will most certainly out last my home-made cable. However, I am cheap, and when my wife wanted to use her buds, I built the second cable. Attached is the diagram.

-Scurrie
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File Type: pdf Autocom headset cable.pdf (71.3 KB, 1469 views)
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post #3 of 5 Old Sep 21st, 2007, 1:02 pm
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Quote:
Originally Posted by mrbiker

Also, since your answering, can you add the $4 Rat-Shack Isolation Transformer to a stereo cable to solve any noise problems? If so, which wires?

If not, is there a stereo version you all use?
I assume you are connecting a audio device for music that is powered from the bike battery. This can cause noise problems due to ground loops created from the different power connections. The cheap RS isolation transformer is not suited for high quality audio (good for voice quality though), and is not stereo. You will need a real stereo isolation transformer designed for music applications. The Autocom part works well, but also any isolation transformer from a car stereo supplier will work (the type used for external amplifiers), but these will have the wrong connectors and you will have to cut the cables and install new connectors (or use a bunch of adapters....ugly!). RS does sell one of these, their part number 270-054, for $16.99.

Hope this helps,
-Scurrie
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post #4 of 5 Old Sep 21st, 2007, 1:40 pm Thread Starter
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Less than 12 hours later I have my answer.

AWESOME.

I'll make one and let you know how it comes out.

Thanks SO much.

mike
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post #5 of 5 Old May 4th, 2012, 11:37 am
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Re: Please help me add earbuds to my 7 pin Autocom connector...

Reviving an almost five year old thread because:

a) the pinout information and earphone wiring diagram is awesome; and
b) I have a follow-up question for the community on the topic of ground loop noise and isolation transformers as raised in post #3 of this thread.

So...

Regarding ground loop and isolation transformers, I have the noise issue when my iPod (or iPhone) and/or my ICOM GMRS radio are plugged into a 12v socket for in-use charging/use and the device is connected to my intercom.

Do I need an isolation transformer for each of the input circuits, or is there a way to filter the noise from the DC power outlet, thereby providing "clean" power for whatever device is drawing from it and eliminating the static?

Antony (Tripod)
Dallas' Northern Suburbs
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