DIY Isolation Transformer to Audio Cable - - Excellence in Motion
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post #1 of 3 (permalink) Old Jun 26th, 2008, 6:28 am Thread Starter
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Join Date: Aug 2007
Location: Doyline, Louisiana, USA
Posts: 302
DIY Isolation Transformer to Audio Cable

Help Meese, where are you? I have a slight intermittant buzz from GPS/MP3/XM radio from Zumo 550 to Autocom Pro Avi via 3 wire audio cable. Was fine when autocom was powered from acc port under seat, but I moved it to tankbag and now powered from acc/port at front.

I have in hand the Radio Shack Isolation Transformer #273-1374 $3.99. The cable has 2 audio wires and the shielded ground, the transformer has only 2 from each winding.

Which wires of the transformer do I put to where?

I have a little trial and error experience, spent all day yesterday hooking another transformer up to the Escort 8500 x50 but it is mono. RD works fine now, loud and clear no buzz.

I only have one cable left and do not want to destroy it for the GPS. Thanks for your help!

I have a feeling it is the tip and shield ground and continue the middle thru but no electronics expert here for sure.

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Last edited by dhanson; Jun 26th, 2008 at 9:14 am.
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post #2 of 3 (permalink) Old Jun 26th, 2008, 3:23 pm
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Join Date: Apr 2007
Location: Oxnard, CA, USA
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Geez, can't a guy get a little sleep around here?

You know, I never did have much luck with those Radio Shack transformers. The one you mentioned is only a single-channel transformer, so you'd really need two to get the stereo signal through.

What you need is a stereo Ground Loop Isolator. That one has RCA jacks so you'd need to get some 3.5mm stereo-to-RCA converter cables. Or just search for a Ground Loop Isolator that already has the 3.5mm plugs. Try looking at iPod solutions, for example.

Or you could contact Autocom and see if they have a Zumo-specific cable that already has the stereo isolation built in. It'd probably be pricey, but would be the simplest solution.

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post #3 of 3 (permalink) Old Jun 26th, 2008, 6:03 pm Thread Starter
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Join Date: Aug 2007
Location: Doyline, Louisiana, USA
Posts: 302
There you go, alright, didn't think that would work, glad I didn't cut the cable. Thanks.

Go take a nap!

12 Super Tenere 1200 (coming soon)
10 MTS1200 standard (riding)
09 Monster 696 (wife's ride)
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