About "Ground Loops" in car stereo

[thedag]

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

[firechief]

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]

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

[thedag]

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

[Perry Babin]

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]

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

[Perry Babin]

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

[thedag]

Where can i get good transformers for cheap??

[TheBaronGroog]

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

[Perry Babin]

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.