Re: Headphone amp / mixer

Posted by bones79 on
URL: http://guitar-fx-layouts.238.s1.nabble.com/Headphone-amp-mixer-tp44796p46146.html

Hi Mao!

I'm afraid I need your help again, if you have time. I built and housed the layout, and the aux audio input and headphones output seem to work nicely - mp3s played on my phone sound great through the headphones. Guitar also sounds good when plugged in.
Unfortunately, there's an awful whine through the circuit (sounds similar to Eb, top E string 11th fret) even when there's nothing plugged into either input. It is emphasised by the vol and gain knobs (to the point of howl) , and pans left/right with the balance knob.
Any ideas?

Thanks mate!