Mains hum + RF interference

[Den Murray]

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

 

[Vlad]

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