Recent content by JTEX

Check the voltage of the original supply under load. Put a beefy 50ohm resistor (1w or more) across its output (to draw about 200mA) and see if it holds the voltage. You can make a beefy 50ohm out of 4x 200 Ohm in parallel if you don't have one.

The PT2399 noise/grit at longer delay is quantisation noise (error) due to the low amount of on-chip memory being stretched too thin. If you want to use longer delay times (say 0.3s or even 0.5s) without excessive noise, the best you can do is to limit the chip's bandwidth (darker repeats). I...

I can't imagine many folks willing to build something as elaborate as this. I, for one, just bought one.

I think the Rockman magic is in the distortion+ chorus. No chorus (as in Proposition/Ultimatum) -> less magic. And I also bought an X100 pedal, even though I made my own version :) Sounds great, actually.

I've been sitting on the last two. I might let one of them go to a good home.

To quote Linda Evangelista, "I don't get out of bed in the morning for less than $10000" :)

Max 1 hour from start to Gerber files.

As I'm getting older, I've softened up my stance on the dry/wet blend. Slightly damp or moist is OK, I guess.

There's a tool specifically for that sort of nut, or you can probably fashion one out of some metal tubing: https://no.rs-online.com/web/p/potentiometer-knobs/0225760

There's a nut under the top. Tighten it and it clamps on to the (solid round!) shaft.

I hate wiring passionately enough that if I were to make pedals in some kind of volume, I'd try my best to have every component on the PCB. Jacks, switches, you name it. Everything except maybe the footswitch, due to mechanical stress/vibrations. It takes a lot of design work to make this happen...

I'm not a real engineer either. Best to try this on a bench or in a simulator, check for stability and so on.

R2 can go as low as U1 can comfortably drive without distorting, so probably not much less than 1k if you're using a TL07x. At the other end of the range, I probably wouldn't go over 5k to keep the noise low. When choosing a P2 value, keep headroom in mind. 1+ P2/R2 is the U2 gain, and too much...

I don't see why precision opamps (low DC offset) would make a difference. You can change the C2 value to whatever you like. It just gets multiplied by 1 + P2/R2.

I would actually use a dual opamp in real life. The only reason you see 2x OPA196 in the schematic is that I did it in a simulator and there are no dual opamps there. TL072 ought to work fine, too, if you're not into SMD.