TSGL: 60 Hz Hum from Laptop?

[Trio800_BonBon]

You have a ground loop hum

If your amplifier's 110V plug is 2 prong non-polarized, 
try reversing that plug in the socket. You can also 
play around with other audio electronic plugs. You may 
have to experiment with the plugs of various components 
until you get the lowest hum level in the system.

More info on this problem and more complicated 
solutions can be found here:

http://www.smr-home-theatre.org/Ground-Loops/

Bob

Geoff Glave wrote:
> 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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