this could be due to an earth loop, caused by the computer and hi-fi being
earthed at different points, so there is a minute voltage difference
between the two.
The easiest way of eliminating this is to use an earth loop isolating patch
cord, which has a small transformer in the line., thus breaking the
electrical circuit between the computer and the hi-fi.
I had a similar problem that drove me crazy for a couple of years, but was
solved by using one of these cords, purchased from a specialist dealer over
the internet.
However, it cost more than 20 pounds, so try every other solution first.
i.e. that all the audio plugs are pushed securely into their sockets
My problem was caused by my TV audio output and my computer's sound card's
output being attached to my hi-fi together, one earth being provided via the
cable TV box and another earth going to my computer via the broadband link.
It didn't matter that both were being provided by Virgin media, or that both
were also earthed via my house's main earthing point.
Sorry I can't provide details of where to buy the cable, but you should be
able to find a supplier via google.
HTH
Steve Green
----- Original Message -----
From: "Steve Robertson" <sroberts...@comcast.net>
To: "PC Audio Discussion List" <pc-audio@pc-audio.org>
Sent: Monday, April 06, 2009 3:50 AM
Subject: eliminating hum?
Hello all.
I am running a simple patch cord from a y-cord plugged in to the output of
my sound card over to a cord which splits to two male r c a plugs which
are in turn connected to my stereo amplifier. For some reason this is
introducing a low level hum both in the stereo speakers and the speakers
connected to the other half of the y-cord from the sound card. Does anyone
know of any way to eliminate the hum?
Thanks.
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