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https://docs.pedalpcb.com/project/archived/Simulcast.pdf Subbing a 150uF wouldn't have any impact.

This trace (on the bottom of the board), these solder joints, or the footswitch itself. There have been a few occasions where a pedal had no sound in bypass because the tip of one of the jacks was touching the enclosure. The circuit gave enough amplification that it'd pass signal when on...

Yep, but keep in mind they use a special version of the Power I/O module (the Flush mount version) with the DC jack positioned slightly higher so it protrudes through the enclosure.

That one is designed to mount inside the enclosure, the jack shouldn't protrude through the enclosure. If the jack is shorting to the enclosure you can enlarge the hole. There is a flush mounted version, as well as a faceplate in the event you don't have any square drill bits...

The controls behave like analog pots. For example: If you turn delay time all the way down, switch modes, turn it all the way up, then switch back to the previous mode the delay time will be all the way up because that's where the pot is set. The previous setting before switching modes is not...

I'm suspicious of that TL072. Do you have another dual opamp you could try in that socket? (Just not another TL072 from that same batch)

Yes, that portion of the circuit is basically just an adjustable LED flasher. The LED just happens to be pointed at a light-controllable amplifier.

If cycling active/bypass had an effect then the problem is most likely either the footswitch itself or a leaky input or output coupling capacitor.

D2 (an LED) shines on LDR1 (a light dependent resistor).

Is this the update I've been waiting for? 😲 "Speaking of schematic display, Seth Hillbrand added live junction updates when dragging items in the schematic editor, and a warning when dragging some wires will cause them to short-circuit with others, so you can see a preview of how...

My guess is that it's a standard Muff with a Mid pot added to the tone stack... For some reason I thought this one had an additional amplifier stage but now I'm thinking it was the LED drive MOSFET for the millenium bypass. I've only peeked inside so far. There are components under the...

There are multiple in parallel because they're located in different places on the PCB. The goal is closer proximity, not so much additional capacitance. With that said, you could probably omit one or both of them without a tremendous (noticeable) impact...

Follow what is printed on your PCB, things have been moved around a bit. (You have the newest revision)

Not exactly on the bench right now, but in the vicinity.

https://forum.pedalpcb.com/threads/sola-sound-yellow-hybrid-tone-bender.5855/

You could have an ATTINY13, 25, or 85, depending on what was/is available at the time.

UPS has never been a forced option. If USPS wasn't available it was either due to an issue with their live rate system, shipping suspended to your area, or the shipment exceeded their maximum limits (First Class International is limited to $500 or less declared value, for example). If for some...

I'd be willing to bet the Harp Octave is a Green Ringer clone. Yes, the Harp Attack has a sub-mini tube. Anyone recognize the circuit?

Any idea which one he liked?

Yessir. 😲 Ahhh, you're riiiight. That didn't even catch my attention until just now. Yep, two NPNs. Q1 NPN Silicon BJT hFE=127 at Ic=4.99mA Vbe=0.673V at Ib=1.00mA Vbe=0.759V at Ib=5.00mA VceSat=0.066V at Ic=5.0mA and Ib=1.00mA IcLeak=0.000mA Q2 NPN Silicon BJT hFE=125 at Ic=5.00mA...