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thedag 24th January 2012 09:51 PM

About "Ground Loops" in car stereo
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

firechief 24th January 2012 10:04 PM

What kind of noise? Just one thump, or a whine that changes with the engin RPM?
Is this an I pod or phone ?

Perry Babin 24th January 2012 10:10 PM

You can buy ground loop isolators at virtually car audio shop.

thedag 25th January 2012 04:35 AM

its not just 1 thump, its continuous whine...
and its iPhone.

Perry Babin 25th January 2012 05:57 AM

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.

thedag 25th January 2012 06:30 AM

I know that it will solve the problem.Thats why im asking if this transformers will be ok to build the isolator....

Perry Babin 25th January 2012 08:47 AM

I don't think so. Those are RF (Radio Frequency) transformers. The transformers you need will be larger. Likely about 1" cubes (approximately).

thedag 25th January 2012 08:55 AM

Where can i get good transformers for cheap??

TheBaronGroog 25th January 2012 11:36 AM

Off the back of an old stereo ISO cable, black box in the perm supply wire. Go to a scrap yard:)

Perry Babin 25th January 2012 12:45 PM

He's looking for audio transformers with complete isolation between primary and secondary windings, a 1:1 ratio and suitable for preamp level audio.

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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