In article ,
Clive Mitchell wrote:
There are instances when mains hum does occur due to ground loops. These
can be fixed with sensible audio cabling and on a balanced system you
can lift the screen at the signal source end of a line-level cable. For
completely awkward electronically induced hum and noise (like a laptop
connected to your hi-fi!) you can use a pair of audio isolating
transformers as available form Maplin (Bleurg!) at a modest price. (Go
for the car audio ones where they are paired in a plastic tube with a
pair of phono connectors at each end.

There are some in the professional audio industry who are so utterly
clueless that they actually believe that "lifting the ground" means
cutting the earth wire in the mains plug! This is a great way to kill
people.

With standard unbalanced connections, removing the mains earths from
everything but one is usually the best way to go. Of course I can't
recommend it on here...

--
*You! Off my planet!

Dave Plowman London SW
To e-mail, change noise into sound.