Phase II LFO issues

[thabigburrito]

Hi everyone,
I’ve recently taken on a few builds, the most complicated being a phase II and (unsurprisingly) being the one with issues. Signal bypasses fine. When on, the indicator lights, the yellow LED turns on but does not vary in brightness, and the signal cuts. Playing very loud, I can get a fuzzy gating sound to come out, like a super misbiased fuzz pedal. There is also a significant amount of 15-17k oscillation hitting my interface (made troubleshooting that much more grating), but I'm not sure if that’s normal or not. Any advice would be much appreciated, thank you guys.

 

[thabigburrito]

Update: I took the easy way out and got a new pcb since i had spares of all the parts. Put it together last night and it worked first try, only thing i did differently was soldered the op amps directly to the board instead of using sockets.

 

[MichaelW]

Update: I took the easy way out and got a new pcb since i had spares of all the parts. Put it together last night and it worked first try, only thing i did differently was soldered the op amps directly to the board instead of using sockets.

Wow, that's commitment! Them's a lot of TL072's on that board. Glad to hear you have a working pedal!

 

[Synchrony Pedalworks]

Update: I took the easy way out and got a new pcb since i had spares of all the parts. Put it together last night and it worked first try, only thing i did differently was soldered the op amps directly to the board instead of using sockets.

Glad to hear. I have this circuit in my queue and was hoping that your fix was straightforward.

 

[itslakedad]

Update to this because I just went through what I think may be the same problem. I had a similar issue where the LED would turn on but not modulate and the TC1044 got really hot when powered on. I measured the voltage and pins 4 and 5 were both giving about 0.7V, which looked weird so I swapped out the chip and voila! Phasey goodness.