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Isn't this similar? https://thepillpedal.com/

The behavior has always been a little wonky.... you had to type in the PCB### then not hit enter and the results pop up. I patched it when this thread came up, it should search when hitting enter now.

You can use a switch to instantly increase the Feedback control to maximum, but you'll never get more feedback than you have with the control turned all the way up. If the feedback pot at maximum isn't enough you'll have to add a feedback path around the FV-1 IC.

Those pads are both grounded on the PCB itself. I don't have the schematic in front of me but I believe they use switched mono jacks... this would ground the input when nothing is plugged into the input jack. The short should go away when a plug is inserted.

@Ginsly is going to want to see this.

I need to start back on it soon. I put tracing things on hold when I lost my desk, but that's taking much longer than expected so I've started easing back into it again.... at my workbench, of all places. I've never traced anything at my workbench and it feels weird.. Different bench...

InterFET has been manufacturing them for years, I'm not sure if they ever stopped? I have them in the shop for $4, which is cheaper than Mouser but still too damned expensive for a transistor that used to cost pennies.... Then there's the other thing... I assure you these are genuine, but...

Yep, they're good. I order them directly from Daier.

You shouldn't need an input buffer.... it wouldn't hurt, but it really should work without one. An active mixer would certainly be ideal, but again, you should be able to passively mix the outputs. The two yellow wires in your image (the ones between the footswitches) should be resistors...

Is that the one DBA used in the Evil Filter? EDIT: Yes, it is. It's basically just a state variable filter in a single package, you can build one using a TL074 and the values listed in that image. https://docs.pedalpcb.com/project/Pro-Filter.pdf I'm sure there's some audiophile hifi...

Can stripboard handle that kind of current?

I've seen three, they all looked like that. It looks terrible but the PCB is about as secure as a Boss pedal when everything is put together... With that said, I really really really don't want to trace this stripboard. I don't mind goop, 4-layer PCBs, SMD components on both sides, caps with...

Hmmm..... It's been so long since I played with one of those I really can't compare... I think this one has quite a bit more gain, but honestly I don't remember pedals I plugged in earlier this week and it's only Tuesday. 🤣

No, for that one they slapped a single tone control on the end of a Soldano SLO and swapped two component values. Somehow it works better than having the full tone stack... 🤣

Nah, it's this one. I knew ahead of time it was going to look like that.... but to be fair, it does sound great.

Without looking Aion's schematic.... The DS-1 output is buffered so it is swamping the output from the Rat. You'll need some form of mixer at the output. It can be as simple as a pair of resistors.

Sometimes you just need one more row ..... I can't say that I've ever seen this technique.