Hi I think the waveform I am seeing is something intriguing but unrelated to the reason why i am hearing interference. I believe the problem is to do with my bridged amplifier output. the two terminals are both at 2.5v so there is no potential between them. this works fine for a speaker output and effectively doubles the potential power from +5v to -5v. but when i take a single channel then the potential of the speaker is 2.5v as referenced to ground. i cant feed the other 2.5v channel into the ground channel for obvious reasons.
at least i think this is the problem.
is there any way i could convert my bridged amplifier output into a normal one? i know that one can do something with capacitative coupling...
I'll do my research but any help would be very much appreciated.
(note: i am still intrigued by that waveform, if anyone still has information about it i would be grateful for that also)
Thanks!