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As some of you may have seen, I just ran into a similar issue with oscillations with my new Mofeta build so I was back here in the forums looking for advice on troubleshooting again. While test driving a suggestion from @Robert to move my input jack further from the Master potentiometer...

OK...something dawned on me while test driving the input jack suggestion from @Robert My current basement rig has the guitar running to a 2 loop switcher then out to my amp and I have been testing the Mofeta and the Boogie Monster in the first loop. With that arrangement, the input and output...

Thanks @Robert Just moved the input and output as far away from the board as I can. Pedal is still squealing with BRIGHT fully CW and the MASTER around 1:00. I can set both controls full CW without oscillation with the guitar's volume at ZERO but the squeal comes on once I turn the guitar's...

After setting aside my Boogie Monster which continues to squeal at high volume settings, I put together a Mofeta build...and now it's squealing on me too! For the record, I've managed to tame the squeal in the "normal" channel by setting the bias on Q2 at 4.5v; however, with the "bright"...

Thanks for doing all that testing and sharing your results @micmac ! It's super interesting that you do not some differences between the SMD and through hole J201s and the fact that your "preferred" bias settings are over 6v make me feel a little better about having mine in that range before...

I tried to shoot this short video but found that I couldn't hold the guitar, dampen the strings, adjust the knobs AND focus the camera so I put down the camera, set the guitar on the floor AWAY from the amp (to avoid regular feedback), and dampened the strings while I adjusted the pedal. The...

The oscillation changes pitch and eventually goes away when I adjust the guitar volume but using a buffer doesn't help (I tried my Boss Blues Driver and my DIY "buffer battle" which is the Klon buffer on one side of the 3PDT and the Cornish buffer on the other side).

I have a sneaking suspicion I am just going to have to be content to run the controls at lower levels...which is probably fine for the amount of volume and gain this circuit has...but I'd sure love to know what causes my build to oscillate and another to be oscillation free. Makes sense when...

Completed my Boogie Monster build and it is sounding pretty good except I seem to be one of the unfortunate ones with some squeal/oscillation at the top ends of the VOLUME and GAIN controls. I followed the advice from @Chuck D. Bones, socketing R102 so I could swap the stock 100r with 1k and...

Thanks so much...and apologies (never thought to look on that tab).

Just ordered the Thunder Chicken and I'm working on an enclosure layout. In the absence of the build/drill documents, I wondered if anyone might know the outside dimensions of the board? In the meantime, best of wishes to @Robert

As @phi1 shows above, it appears the online Ohm's Law calculator lead me astray! That makes the LED death all the more mysterious but at least the 1/4 watt 15k resistor seems to be working. Here's how this build turned out:

I installed a 3mm blue LED (Vf~2v according to Tayda) with a 10k resistor (1/8 watt) and everything worked on a 9v supply. The LED went out VERY shortly after I switched to my 18v tap and the compressor stopped working. I crossed my fingers that the dying LED just gave those 18v a quicker path...

OK...I added a 1uF tantalum cap on the output of my buffer with a 100k resistor to ground. Not sure if that fixed my output level issue or if it was removing a TINY bridge between two rows on my vero, but my 100% dry blend level on the compressor now matches my bypass level so I'm happy with...

Thanks @phi1 and @Feral Feline. I have tantalum caps in 100nF, 220nF, 1uF, 2.2uF, and 10uF so I'll choose one of those (likely 1uF based on the comments above). Would you agree with the last comment under the parasit schematic that I should also include a 100k resistor to ground following the...

Glad to hear I should be OK with the 18v input but can't believe that I missed reading that comment about the caps...thanks for the quick catch! Hopefully that simple addition will make the levels more consistent... For my own clarification though, in the layout I'm using, does the 100nf cap on...

Hmmm, I must have missed that. DRAT! What does that output cap do if I add it as suggested? The other thing that just dawned on me is that the buffer circuit will be powered with the same 18v as the compressor circuit since the recipient asked me to omit the Zirc Jr's charge pump so he can...

Got everything wired up and it tests OK in terms of FUNCTIONALITY but what caught my ear was the fact that PEDAL's output with the Blend knob set full CCW (ie. all clean signal and no compressed signal) is lower than the bypassed signal. My assumption is that when the Blend knob is set to "full...

Thanks @phi1. Right after posting it occurred to me that the level control is probably more like the "make up gain" of the compressor...

Apologies for bothering everyone again...and for taking this thread off on another tangent but I am in the final stages of completing my own Zirc Jr. compressor with a spliced in blend and something just occurred to me: Like @phi1 my plan is to run the input into both the compressor and the...