Hi frazzman, congrats.
I didn't have squealing on my unit, is it on both channels? On my self-etch I reinforced some traces with solid core wire, because eq bands were cutting in and out. A few hours with the continuity checker and I figured it out. Self-etching was a blessing and a curse...
I had squealing come up on the optical desser I built, only when I cranked the threshold all the way up, some high frequency oscillation... I too wonder what causes high frequency oscillation?
Hi Bieck, thats for the reply! Channel 2 isn't finished yet so I can only confirm on channel 1 for now. I do have a couple of tracks that aren't as thick as I'd have liked (when compared to a commercially produced PCB). I did use a DMM to measure continuity across and 'suspicious' areas to make sure that the circuit wasn't broken anywhere due to thin tracks, but everything checked out.
As I said, its only on the 2500k and Air band, with either pot maxed out that I get the squealing... soon as I turn the pots back a notch it goes away, the boosts on both bands seem to be working fine though... I can hear the obvious high end boost.
Anyway... its really odd, I thought maybe it was due to the inductors, I removed them and bridged the gaps with resistor legs, it didn't really make a difference for better or worse.
I suppose I could live with the issue as it doesn't have that much of an impact but it is damn annoying. I went through this entire thread but no one else mentioned it. I'll see what happens with channel 2.