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I’d probably just use the 20k log pot and leave R5 empty. Using the 18k with a 25k linear pot would result in a reverse log taper, very hard to find the sweet spot for a volume pot. Graphing the math, blue is an approximation of the log pot, pink is the Timmy (log 25k with 18k, turns out to...

Woah that is super cool. I have tried this concept with a printed faceplate from AmplifyFun. Light bleeds through the printed black ink. Great to have another idea. Is it bright enough to function as the ON indicator? would the light shine through a white silk print layer? Or do you only do...

Is the D3 led pulsing? I can’t tell from the build doc but I think it’s probably the blue one in your build. That info would help narrow it down some.

Next question, should I be using JIS screwdrivers on pedals? I’ve always just used Phillips on the enclosures, hadn’t thought to try JIS to see if it fits better.

We have some at work. Branded Vessel - Armor Grip. They work great with JIS screws. Huge difference compared to when we were trying to use Phillips drivers with small JIS screws. Compared to Erik’s link… it look like the same set. Same grip shape, same price, just printed with English words.

Hey I remember seeing your posts on the tagboard site way back in the day. Inspiring stuff. Check out the Tommy switch for more gain. To do similar on the Mach 1, reduce R11. The catch is, for the same frequency response; you need to scale the other components (scale R12 the same percent as...

A bit about transparent OD When you clip the signal, the EQ doesn’t sound flat. Clipping the wave adds harmonics which affect how you hear the EQ. Clipping adds some harsh high frequencies. Clipping low frequencies muddies up low mids. The vast majority of dirt pedals follow this path, to...

For the diode thing, you could just have the switch bypass D2 for the symmetric mode without adding diodes.

https://www.pedalpcb.com/product/pcb581/ Currently out of stock.

I wonder if the noises would go away without the charge pump. Unfortunately, it’s not as simple as just pulling the chip out, it would require some effort to mod. PPCB does have the eunuch buffer (same as skeptical but sans charge pump). I would think 0~9V would be fine for a buffer.

Each patch is limits to 128 code lines. It has more to do with how it processes the number of lines in the code within the sample rate. (It has to run the whole code within each sample rate (32.768kHz if you use the normal crystal) Cant increase code length at all beyond that no matter what.

Very cool combo. For a stand alone muff pedal, you can also change the capacitors to get a flat or even mid-boost. Not sure which version of the Muffin you built, but doubling C11 often does the trick. Check out the site "tsc in the web", it graphs different amp and pedal tone stacks...

For 1. It’s possible if you do your own pcb design but it’ll be tight, have to be a really small drive circuit. Unless you do stacked pcbs (such as the PPCB Byzantium). 2. The PPCB fb-1 development board is what you’re after. It took me a bit of finagling to get the programs running on my pc...

Hmm it should have worked, assuming you kept R7, R16, and R17 populated. If the FV-1 pins are not connected to anything, they are floating and can change state (from 0 to 1) dues to electrical noise. The 100k pull-down resistors make sure the pins are solidly in the 0 state. Even if you...

Can you check the resistance across R28 and R29? The stripe that should be orange looks red in the pic for both. (Thought stripe color in pictures is tough). If it is red, then they would be 6.8k instead of 68k. That could maybe explain that they isolating the bypass from the effect of the...

Yes, but it may or may not be disagreeable. Here’s a graph roughly showing the sweep of a 250kA (blue) vs 1000kA + 330k in parallel (green)

A quicker mod would just to be to add a resistor (such as 330k) across the drive pot (lug 1-2). This will work in parallel with the pot resistance. (Max would be 1000k || 330k which equals 248k). You could either do this as an experiment to determine your desired max, and then use a pot as...

hmm so this isn't a stomp, it's meant to sit on the piano. But interesting idea... I looked and around and didn't see many options for guitar pedalboard stomp metronomes, beside in some multi-fx units. I wonder if anyone would use something like this. The input jack allows running your...

If I follow the result correctly so far, it seems like an issue in the IC2 area (whether the chip or something else). You could remove the TL072 (ic2) and check the voltages again. (With the charge pump back in). The voltages were weird before. We’ll see if removing the chip and measuring at...

Yep I had no doubt of being understood around here for that.