Help with laptop noise issue

Jimmy Gibson · Post by **Jimmy Gibson** » 30 Nov 2006 10:29 am

HELP...I have just got a laptop pc,it works great though my HI FI System,but when i put it through my PA,then it makes a terrible buzzing noise,it is so loud i can`t play my CD`s ect,but what is strange to me is if i dissconect the mains adapter the noise stops any help into why it should do this,and how or if can i cure this problem? would be very welcome thanks in advance.

Jimmy.

Jack Stoner · Post by **Jack Stoner** » 30 Nov 2006 10:39 am

It's the standard "ground loop hum" issue. The differnce in AC ground potential between the laptop and PA. I suspect if you run the laptop on battery the hum will be gone.

I don't know about the UK mains but in the US, if we remove the ground from one device the ground loop goes away.

Jimmy Gibson · Post by **Jimmy Gibson** » 30 Nov 2006 11:05 am

Thanks Jack,i took trhe earth of the plug brilliant,worked great no more noise only the music,thanks so much God bless.

Jimmy.

Andy Sandoval · Post by **Andy Sandoval** » 30 Nov 2006 1:12 pm

I had that same exact problem and just put one of those three to two prong outlet adapters on the computer cable and got a nice quiet sound.