Mains hum + RF interference

Feb 25, 2004 1 Replies

Hi Group



I'm looking for a simple solution to an annoying problem.



On my PC I've got a set of external (mains powered) speakers. I've got a couple of annoying problems that I'm sure should be rectifiable, but I don't know how!


  1. When the speakers are turned up high I hear a mains (60Hz) hum.
  2. I sometimes get really heavy interference from what sounds like local walkie-talkie / taxi service / emergency service (mainly noticable when the speakers are (i.e. powered up) but have no audio output going to them.

Any ideas how to stop this?



Cheers



D

It looks to me you have a ground problem. In order to detect a modulated carrier you must have a detector (a non linear connection) A bad ground. Have all grounds together and grounded only at one location.

Vlad

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