New, generic AC adapter is causing my computer speaker system to hum. I thought it was a ground loop, but a cheater plug (fitted on the jack of the AC adapter) didn't help. (The speaker system itself is not grounded.) I know it's the AC adapter, because if I run my laptop on battery power, the hum disappears. Anything I can do, short of forking out $70 for an original adapter? This adapter has been working fine otherwise. [more inside]
posted by ori on Mar 23, 2009 - 8 answers

I've just inherited an old Hitachi crt TV (15 years old). Since I've turned it on, it has never ceased to make an annoying humming. I thought it came through the speakers, and then realized that the noise was the same even if the sound was turned off. The noise is distinctively louder when the image is bright, and softer when the image is dark. I gather there's a problem with the tube energy supply, but after this point, there could be lions, dragons or monsters behind the tube, it's terra incognita. So could someone provide me with an explanation and some easy instructions to solve the problem ? Thanks !
posted by nicolin on Oct 11, 2008 - 13 answers

MusicGearFilter: I've got a hum in my recording/performance setup. I think I know how it's getting in -- a balanced mic cable going into a piece of gear with an unbalanced jack. How do I fix it? Full details within. [more inside]
posted by Artifice_Eternity on Jan 15, 2008 - 6 answers

Why is there a low hum when I record with Vista? [more inside]
posted by superbird on Nov 1, 2007 - 5 answers

What is this song stuck in my friend's head?
posted by mzurer on May 4, 2007 - 7 answers

My phone has a loud buzzing noise. When I touch the screw on a lightswitch plate, sink faucet or a metal lamp, the buzzing stops. What is happening – and more importantly how can I use the phone without having to ground myself? [more inside]
posted by kamelhoecker on Apr 12, 2007 - 4 answers

Telecaster Hum... Why won't it GO AWAY? Please help, I just installed some new pickups. [more inside]
posted by jimmyhutch on Feb 12, 2007 - 7 answers

What DC to AC power inverter can I buy for use in a car that won't contribute hum to an audio signal from devices it powers? [more inside]
posted by odinsdream on Nov 15, 2005 - 11 answers

HumFilter: how do I stop the audio connection from my DVD player humming? [more inside]
posted by russmail on Jul 13, 2005 - 9 answers