calling maestro s&h builders

[swt]

Hi guys!. I've got my filter working ok, but it's ticking and oscillating to a small degree when bypass, even though i used a true bypass, shielding cable on input and output, and also to and from fx. Any suggestions?. Thanks a lot!

[Michael Allen]

Did you use a good layout? maybe the lfo is bleeding into the signal or ground or something like that because it's not lain out cleanly enough

[Paul Perry (Frostwave)]

If it is shielded & still picking up LFO clicks, then I think it is an earth wiring problem, try running a thick wire directly from the input socket ground to the output socket ground.

[swt]

ok i'll try that. Maybe it's because i have something like 8.6 volts on the neg rail and 9 on the positive one. Can this be a cause?
I've used ggg layout, but redid it in a 10cm x 10 cm so as not to have problems with ticking. It end up ticking on bypass as oposed to be in the filter mode like anybody else's.

[Paul Perry (Frostwave)]

I havn't built it myself, but I dont think that 9v vs 8.6v is a problem. how internal interference sometimes happens, is that a large current spike (like when a LFO switches) flows along the board (power rail or ground) and, that makes a momentary difference in voltage between any two points along that chunk of PCB trace (because, the PCB trace has a slight resistance to it). And, that is where the interference comes from, the ground is actually bouncing up & down. I don't drink, but if I did, this would probably be why.