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Old 24th January 2012, 08:51 PM   #1
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Default About "Ground Loops" in car stereo

Hi,
I Want to build "audio isolator" for the Aux input in my stereo.
Its make noises when im connecting the device to the aux and to the charger together....

is this transformers good for this project??
Minicircuits TC1-6-75 SMD 1:1 RF transformer (Qty.5) | eBay


Thanks in advance, thedag
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Old 24th January 2012, 09:04 PM   #2
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What kind of noise? Just one thump, or a whine that changes with the engin RPM?
Is this an I pod or phone ?
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Old 24th January 2012, 09:10 PM   #3
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You can buy ground loop isolators at virtually car audio shop.
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Old 25th January 2012, 03:35 AM   #4
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its not just 1 thump, its continuous whine...
and its iPhone.
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Old 25th January 2012, 04:57 AM   #5
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A ground loop isolator will break the loop and, if the iphone doesn't have noise if the charger is disconnected, will stop the noise.
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Old 25th January 2012, 05:30 AM   #6
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I know that it will solve the problem.Thats why im asking if this transformers will be ok to build the isolator....
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Old 25th January 2012, 07:47 AM   #7
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I don't think so. Those are RF (Radio Frequency) transformers. The transformers you need will be larger. Likely about 1" cubes (approximately).
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Old 25th January 2012, 07:55 AM   #8
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Where can i get good transformers for cheap??
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Old 25th January 2012, 10:36 AM   #9
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Off the back of an old stereo ISO cable, black box in the perm supply wire. Go to a scrap yard
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Old 25th January 2012, 11:45 AM   #10
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TheBaronGroog:
He's looking for audio transformers with complete isolation between primary and secondary windings, a 1:1 ratio and suitable for preamp level audio.

thedag:
Is there a reason that you won't simply buy a proper ground loop isolator? By the time that you buy the transformers and audio connectors and pay for shipping on them, you'll end up spending more than the cost of an isolator.
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