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General E46 Forum
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Old 04-10-2013, 01:07 PM   #1
echoes
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Join Date: Jan 2013
Location: Akron, Ohio
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My Ride: 2002 330Ci
Noise through audio input while charging (SOLVED)

I have a 3.5mm input attached to the Business CD changer(cant listen to CDs now). It's a third party adapter.

Audio sounds perfect from iPhone, Android, bluetooth device, etc... UNLESS i have that same player device charging using the cars power. As soon as I plug it in to charge it gives me noise while playing audio.

Now, I'm pretty sure this is a ground loop isolation issue but I don't know the best solution. Anyone have ideas or know a good method for isolating this 12v cig lighter from the cars ground?

Last edited by echoes; 04-15-2013 at 03:07 PM.
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Old 04-15-2013, 03:06 PM   #2
echoes
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Lightbulb Solved this

I bought a "Ground Loop Isolator" for twelve dollars and it was able to eliminate the noise I was getting.
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Old 04-15-2013, 04:50 PM   #3
ixtoxi
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Good to hear. I have the same problem. Where did you purchase the item?
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Old 04-15-2013, 07:09 PM   #4
scottjoh
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Quote:
Originally Posted by ixtoxi View Post
Good to hear. I have the same problem. Where did you purchase the item?
I don't know which one the OP bought, but, I've used this one with success.
http://www.parts-express.com/pe/show...number=265-012
The only problem with ground loop isolators though is they use isolation transformers and their frequency response is not flat from 20-20kHz. Use one of these only as a last resort (or to get you by until the problem can properly be corrected).
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Old 04-15-2013, 07:45 PM   #5
echoes
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I bought this one.

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
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