TSGL: 60 Hz Hum from Laptop?

[Engineman1 at aol.com]

Inside your "power brick" are a transformer, rectifier and filter  capacitors 
to remove the hum. I suspect they are defective.
Can you borrow another power supply to try?
 
Engineman
 
<In a message dated 4/6/2008 2:04:13 P.M. Pacific Daylight Time,  
coover at fastmail.fm writes:

Hey  All,

As part of our entertainment system we've got an old Dell laptop  plugged
into our amplifier.  It's on our wireless home network and we  use it to play
MP3s and listen to 'internet radio.'

However, it's  got an annoying problem.  When the power supply is plugged
into the  laptop (i.e. most of the time) you hear an annoying 60-hertz 'hum'
over  both right and left amplified channels.  If you unplug the power  supply
from the back of the laptop, the hum goes away.  I've tried  running a ground
to some of the external metal on the laptop, but instead  of the hum getting
better (as expected) it got worse.

Any  suggestions as to how to make our home entertainment system work  better?
How can we get rid of this 60 hertz hum?

Thanks in  advance.

Cheers,
Geoff in Vancouver,  Canada








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