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Old 23rd March 2008, 02:11 PM   #1
polyal is offline polyal  United Kingdom
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Join Date: Mar 2008
Default mains hum prob

when i plug my new pc (which is earthed) into my hifi system - i get a
terrible hum

this can be eliminated by unplugging my other devices
( tv dvd player etc ) from the hifi amp

the pc is connected via the the headphone o/p
to a line in on the amp(phono)

my other devices and the amplifier are double insulated
and have no mains earths

has anyone had the same experience - whats the best fix

thanks in advance for any info

polyal
stoke on trent
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Old 24th March 2008, 11:52 AM   #2
burbeck is offline burbeck  United Kingdom
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Join Date: Aug 2004
Location: Ratae Coritanorum
hi
common problem, ground loops, here is a solution that will work
http://www.maplin.co.uk/Search.aspx?...source=15&SD=Y

dont forget to use screened leads
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regards
bob
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Old 24th March 2008, 10:28 PM   #3
polyal is offline polyal  United Kingdom
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Join Date: Mar 2008
thanks for the link

polyal
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Old 26th March 2008, 02:41 PM   #4
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Join Date: Jun 2007
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try plugging it in a different line, aux in? try that.
might be buzzing cos its going thru a phono pre, i dunno.
dave
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