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Hmmmm. That kinda violates the generally accepted rule for stomp switches: Each Stomp Switch should have at least one knob associated with it that governs its actions. Examples: Volume, Gain. There are exceptions, such as A/B switches or the MUTE switch on a Tuner. The effect of that toggle...

Yes indeed, way loud. You could put a resistor in series with C4 to reduce the max volume.

I use a liquid flux that I obtained from work. Not sure which brand. I thin it a bit with isopropyl and apply it to SMD pads with a toothpick.

I seriously doubt it. No. Installing a JET necessitates either removing or reversing D1 because when biased into the linear mode, Vgs on an N-channel MOSFET is positive and Vgs on an N-channel JFET is negative. JFETs are not nearly as sensitive to ESD as MOSFETs, so I chose to remove D1. The...

OK, I just wanted to see if there was anything else that might have contributed to a pop when switching. I don't build stuff if I don't have a schematic, but that's just me.

Try not switching the power to the Cab Sim. That is very likely the cause of the *POP* and it's not necessary. Can you show us the Headphone Amp schematic?

With the booster, this is a pretty high-gain circuit. Here's the difficulty when adding a switch or pot to the hard clipping diodes: the volume coming out of the hard clipper is no longer limited by the diodes. Disconnecting or fading out the diodes raises the volume substantially. We then...

Purty!

Nice build! Yeah, those crazy Ruskies, marking the wrong end of their diodes.

Maybe you could share a schematic? My mental telepathy skills are not what they used to be.

This is a Marshall emulator. In a real tube amp, distortion happens in more than one place. The preamp tubes make asymmetric distortion (clipping). The 2nd & 3rd stages approximate the preamp distortion. The Ge diodes approximate the phase splitter / output stage more-or-less symmetric...

OK, I think this is it. All of the knobs do what I want. I got rid of the Bass Boost at the end and put the BASS control between the 2nd & 3rd stages. It works independent of the DRIVE knob. The LEVEL control is back where it was in the original circuit. I increased the gain of the last...

I'd like to see a schematic of the WIIO reissue pedal.

The purpose of the zener between G & S on a MOSFET is to protect the gate against ESD. The only parts of the circuit that could be exposed to ESD once the box is closed are the IN, OUT and POWER pins. Q2 and Q3 are nowhere near any of those pins. Once Q2 & Q3 are installed on the board, they...

How about we stay on-topic?

Still making tweaks, so standby for the next mod.

Then you're really not gonna like this one... Q1 buffers the input and feeds the Mid Cut circuit (C2-C4, R6-R9 & the MID pot). The Mid Cut eats some bass, so in increased C5 to compensate. U1A now gets stable bias from Q1 instead of the bouncy Vref. The rest is pretty much unchanged except...

Very clean build!

Not really. There are AIAB pedals with multiple stages of asymmetric clipping. I've seen one or two pedal circuits that use a single MOSFET in the feedback loop for asymmetric clipping, The only time I've seen positive feedback around multiple stages in a pedal was to cause oscillation. This...

I'm still tweaking the EQ on the fist stage. Trying to get the mids where I want 'em. I might have to add a switch on C2. with the positive feedback, this circuit is very sensitive to C7. There's a peak in the freq response around 2KHz (see post #1). Making C7 smaller, even by a little bit...