From: Paul on
Man-wai Chang to The Door (33600bps) wrote:
>> If you're hearing hum at 50Hz or 60Hz (whatever frequency is
>> used for AC in your location), then there are isolator devices
>> to stop that. This particular one is inconvenient, as it has
>> RCA plugs on it, and you'd need adapters to convert this
>> device to 1/8" audio.
>>
>> Ground Loop Isolator $16.99
>> http://www.radioshack.com/product/index.jsp?productId=2062214
>> For converting RCA to 1/8" audio, I use one of these.
>> http://www.radioshack.com/product/index.jsp?productId=2103225
>
> Thank you the 3rd time!
>

Ground Loop Isolators are also available on Amazon. The Amazon site
has customer review comments near the bottom of the page. You can
learn more about the advantages and disadvantage of the product,
by reading the reviews.

http://www.amazon.com/Raptor-GL15-Ground-Loop-Isolator/product-reviews/B0009O19LQ/ref=cm_cr_dp_all_summary?ie=UTF8&showViewpoints=1&sortBy=bySubmissionDateDescending

Paul