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Cap is in and it works great. A little tight in there but no problem. Only hear a slight whine on full boost level which I don’t use. At unity level gain, quiet as that proverbial church mouse. Thanks all…
Thanks Brach, it was just a thought but you make sense in how the unit is powered. I tend to use I-Spots and I’ll have to dedicate one to the tremolo pedal. I like to play with a minimum of anything so the whine wasn’t too much bother except I always wondered why… If that doesn’t work I’ll try the capacitor fix. I’ll let you all know what works.
Mine does the same thing when last or in middle of a pedal chain. I’ve had it apart and checked/tested everything. No amount of knob tweaking or pot adjustment made a difference so I put it first in the chain (sonically not the best for me) and LO, noise whine much less. Standalone it’s quiet as a church mouse. Input impedance mismatch? Hope Brach can come up with some ideas…
1.8 Vdc (roughly) on both square pads of HF & LFO LED side.
While I was in there, measured resistance on LSR side of both and there is major differences in values.
everything set in middle position (12:00) except volume
LFO pulses to ~ 1. Kohm
HFO pulses to 24 ~ 25. Kohm, would this value not allow any signal to pass or is this still part of the control path?
Thanks for the FET Brach, That cleared up volume levels fine. Now I seem to be missing any signal from the HFO side of things. In calibration mode LFO sounds fine when Harmonic mix fully counter-clockwise to about halfway. Full clockwise gets nothing except at max gain a faint high-pitched pulse squeal, back to halfway then the LFO seems to cut back in and functions work well. Tempo LED works fine either way. Nothing I can do trim-pot wise makes any difference whatsoever. Case on or off, no difference either.
Ideas please? Test-points I can work with?
Problem found, me thinks. All solder joints look OK, paper insulator not punctured so I was buttoning it back up and lo! The Triad in Q3 is backwards… I’m guessing this is not good for signal quality. I was going to make something up touting my diagnostic abilities but bottom line, I goofed. I’m not going to be able to remove and reinstall safely so please sir, can I have some more?
Let me know what I have to do to get another one. Thanks and for anyone reading this thread, you can’t check your work enough. Live and learn.
Thanks for getting back to me so soon. I double checked all solder connections before assembly but will do so again (third time a charm). I lost my flush-cut nippers and used regular diagonals and I did make an effort to cut all leads as close to the board as possible, even put a layer of tape over the paper next to the pots. It was a tight fit so leakage to signal ground is very possible. I will disassemble/reassemble and let you know. I’ll even change the LED’s to their proper position.