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Here we go Attached image is from this article: https://www.earthquakerdevices.com/blog-posts/killswitch-engagement#:~:text=On%20the%20other%20hand%2C%20a,will%20do%20the%20same%20thing. Read elsewhere just now that the breaking (or interruptive) type can lead to pops when switching...

The diagram has you switching 9V supply to the anodes, so you can leave the cathode always grounded. The diagram is wrong. Option 1: You can jumper the middle-middle to middle-top lugs (currently both black wires) to make the cathode always grounded. Option 2: Or simply run the cathode wire...

Yeah that seems possible, time to test it out I think.

10k is probably still reasonable starting point. I would put a series resistor before lug 2 so that you aren’t overloading the op amp output with a short to GND

Yeah I think that’s a good idea at of saying it. Your signal can be bias around 0V or 4.5V, and it can jump back and forth within your pedal. Each time you want to jump bias, you need a capacitor to block the DC offset. Any op amp stage will be operating at 4.5v bias. You might as well keep it...

Yeah the 470R was just dumping the dirty mostly Vref with the blend knob at min. Think of the typical volume knob as a voltage divider. This would be like having a volume pot at almost minimum (10k at the top, 470R at the bottom). According to simple voltage divider calc (ratio of bottom R /...

very cool, do you leave the CUT knob setting at minimum? (Full treble)?

you can also change the buffer on the clean side into a boost so that the max clean is louder. Add resistor between the op-amp “-“ & “out” pins. More resistance is more volume here. Include a 100p or so capacitor too for good measure. And a resistor and cap from the “-“ to vref. Maybe like this.

I don’t think the originally posted circuit would work. The 470R needs to be bigger to isolate the two signals so that muting the clean doesn’t nearly mute the dirty. Bringing that up to 10k might work well enough without changing anything else. Another way to do additive blend is to exactly...

the volume pot is linear. Replacing with log would help dialing in reasonable volumes.

Nice info ^. I’m planning a build, I’d like to have the cap changes on a switch so that the full low end original circuit is still available. Obviously only 1 capacitor (cathode bypass) is easier to switch out than 4 (coupling). Would you say the 1uF Cathode bypass is a similar effect as the...

Have you looked at the Dung Beetle (Basic Audio Scarab Deluxe)?

Not seeing anything in the pics. My process would be: Check the DC voltage at pin 8 (should be 9v). Use an audio probe to check for signal at various points in the signal flow.

Maybe try running the ROG Tone Mender circuit in spice and see if that gets you in the ballpark, then you could tweak capacitor values or try to match the exact amp values in the tone stack

Kudos for modeling it in spice. It’s a tweaked Timmy circuit, so I wouldn’t have expected to see a mid scoop. I take all specific-amp-in-a-box pedal claims skeptically… doesn’t it depend a lot on what amp you’re running into? Unless it’s like an iridium - full amp/cab sim that’s meant to go...

Check out the Run off groove tone mender circuit. I’ve done a slight variation where I follow the tone stack from a Super Reverb. Not sure it’s what you’re looking for but it will at least impart some of the EQ If you play with the online Tone Stack Calculator, you can see that 3 band EQ...

No hardwiring, just leave the diodes out for program 0. The bit values on pin 15,16,17 decide which program plays. 000 = program 0 001 = program 1 010 = 2 011 = 3 100 = 4 101 = 5 110 = 6 111 = program 7 0v means bit = 0 3.3V means bit = 1 The 100k Rs pull all 3 pins down by default. The...

You could also get the Pythagorus and just not populate the toggle sw. Same result (only patch 0) as the above comment.

Doesn’t make much sense to me, but I’m curious what you find out with other diodes, etc

Pythagorus and arachnid are the same, except arachnid allows up to 8 patches on a rotary switch. You can’t partially select patches, you’re on one patch at a time. The VHS uses 4 separate patches for no reverb/or chorus, reverb only, chorus only, reverb plus chorus. Basically, the code is...