Annoying stereo/equaliser Problem!
I have a cheap head unit with CD player, it sounds fine on its own, but its not very powerful, so, I got an old equaliser out of an old car and stuck it in. The sound is so much better, must be some kind of amp in it. Only problem is, when I turn the equaliser on, I get a whining noise. And the noise increases with revs. Some sort of interference or feedback?
If I remember correctly, it didn't do it when I first put it in, but its been doing it bad recently.
Can anyone suggest what it could be?