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Forum: General Discussion

Topic: AC Power

This topic is old and might contain outdated or incorrect information.

Hi All

I am back with a new laptop I get a hum when I use the ac power and the line out on my laptop , but there is no hum when ac power is not used. Is there a fix for this? Other then
not useing the ac power.

Thanks All
 
Posted Sat 17 Jan 04 @ 3:50 am
DJ RickPRO InfinityMember since 2003
is it a 3 prong plug?
Use a 2 prong adapter if so...

using an external hard drive?

 
Posted Sat 17 Jan 04 @ 7:53 am
HomeboyPRO InfinitySupport ManagerMember since 2003
What usb devices are plugged in also ? I got a bad hum from my cable modem through usb.
 
Posted Sat 17 Jan 04 @ 10:24 am
I will try the 2 prong adapter. Yes I use a external hard drive but it does the same with it or not.The only other usb device is my mouse.
 
Posted Sat 17 Jan 04 @ 10:41 pm
DJ Rick

The 2 prong adapter worked thanks. Do you know y this is?
 
Posted Sat 17 Jan 04 @ 10:51 pm
DJ RickPRO InfinityMember since 2003
It's a grounding issue.
 
Posted Sun 18 Jan 04 @ 12:20 am
@audio000

The problem is called a "ground loop" and is caused by the power supply circuit design of the new laptop. I had the same issue with my new laptop which was the same HP brand as my previous laptop which never had the problem.

Here is the solution : http://www.xitel.com/product_gli.htm

I don't think it's a good idea to run on 2 prong without proper ground.
 
Posted Sun 18 Jan 04 @ 5:52 am
Thanks for the "solution" ;-)

I use the same filter "homemade" by a friend, and it's the best !

Coyote
 
Posted Sun 18 Jan 04 @ 10:31 am
digijoc-Mele

I will try this to , it looks like this would help with someother
things to. Thank you
 
Posted Sun 18 Jan 04 @ 8:15 pm
hi coyote, can you tell us more details about the "home made" solution?
 
Posted Wed 22 Feb 06 @ 5:41 pm


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