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Electrical interference

D

dr.mark

n00b
Joined
Feb 9, 2007
Messages
5
Hi Group,

When I hook up my Dell laptop into my home theatre system there is a hum when I use the power cord - and it goes away when I run on battery.

Any suggestions as to what to do other than running only on battery>

Thank you in advance.

Mark Berman
 
dr.mark said:
When I hook up my Dell laptop into my home theatre system there is a hum when I use the power cord - and it goes away when I run on battery.
Click to expand...

Where does the hum come from - the laptop or the HTS? is it a low pitch or high?

The first thing I think of is a bad ground. If your laptop is at a different ground potential than the HTS, you could get a hum.

If the plug on the PS is not polarized, try reversing it (pull it out of the wall socket, turn it 180 degrees and plug it in again). Try doing the same with the HTS components. Unpolarized plugs have a de facto ground on one side of the plug and putting it in "backwards" can screw up the ground - a good reason for manufacturers only using polarized plugs (or three prong).

The cable(s) (RCA plugs?) connecting the laptop to the HTS may also have a bad ground connection - that should be the outside part, not the pin in the centre.
 
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