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I'm building the Distortion 250 circuit, and I don't have an LM741. I do have a bunch of UA741s, which I know are basically the same chip with different silicone, so I know a UA741 will work. My question is has anyone tried any other Op Amps in the Distortion 250 like an LM308 or a TL072, and...

@bean or anybody else, can you point me to the build docs for the MBP Wavelord. I had them stored in a folder that apparently didn't transfer when I upgraded my computer. I went to the Madbean Pedals page to download them again, but it looks like the Wavelord has been taken off of the site...

Ok, so just another Blue Breaker. I actually built this one a couple of months ago, but I'm just getting around to posting a build report. I've been going through my older builds looking for bogus chips. This one had a bogus TL072 in it, so I replaced it with a legit one, and that's why I'm...

In the middle of a build that calls for an MPF201, which I cannot find. I know I can sub a J113 or a 2N5485, which I also don't have. Just wondering if I can safely swap it out for a J201, which I have plenty of.

I have a few Muffs on my bench right now, and I'm hoping to build some Rats next -- what's your favorite Rat circuit?

I am in the market for a relatively cheap, low-power tube amp that I can use to test pedals. I don't need anything loud, I just need a small tube amp that I can push with some of the high-gain pedals I am building. Just to put this into perspective, I have a Line 6 Spider V guitar amp and a...

I have to say that I'm kind of proud of this one. I really wanted to enjoy this pedal, and I absolutely love it in so many ways. First, this thing is a throw back to the 80s. Besides an EQ pedal (which was my first), my first three pedals were a chorus, a boost and a reverb, and this pedal...

When I started building pedals, I knew this one was going to be on my build list. I've been wanting a phase shifter for a few years now. It's been on my wish list, but I just never pulled the trigger on buying one because I have been able to get a modest reproduction from my HX Stomp. I've...

I just finished boxing up my XC Phase, and it works perfect and sounds fantastic. However, when I switch between 4 stages and 2 stages I get a loud pop. Is this normal, or do I have a problem?

Okay so this is probably a dumb question that I think I know the answer to, but I'm going to ask it to see if anybody has a unique perspective that I haven't thought about... I have a tube pedal that I want to add an on/off switch to. I generally leave my pedal board plug in, and I don't worry...

So this was probably the most challenging pedal I've built so far. It's been on my workbench for at least a couple of months. My first challenge was assembling the optoculper. I had some vactrols in my stash, and I contemplated building this with a VTL5C4, but @DGWVI convinced me that I...

So I built the nutty fuzz, and it all seems to be working fine. However, the level control seems to control the bypass signal and doesn't seem to do much when the pedal is engaged. I had to do a lot of off-board wiring on this one, and I don't know if screwed something up. It just doesn't...

Ok, first I have to say, I was extremely excited to see this build as an option. When I built my original gigging board, I really wanted to include a Noble, but I couldn't justify it since I already had a CIOCS 7 power supply. Instead I opted for the DarkGlass pre-amp, but I always felt like I...

This has to be my favorite pedal that I have built so far. I liked it so much that I built it twice -- I "loaned" my first one to our lead guitarist, and he begged me to let him keep it, so I built another one for myself. I bought the first one because a friend gave me his broken OCD to fix. I...

@Robert Any chance you could add a feature to either the forum or the PedalPCB web site that let's us search for PCBs by the PCB number (if this capability already exists, I apologize for my ignorance). I have a box full of PCBs, and I don't have an easy way to figure out which board is which...

Ok, so everyone has a cursed build from time to time. This was my first (but probably not my last). I built this thing originally with some wrong resistor values -- to the point where I could barely achieve unity gain with it. After that rework, I still wasn't getting modulation from the...

So, as someone who is relatively new to soldiering electronics, how do I know when I need to replace my iron's tip? I've only been soldering for about 7 or 8 months, but I have already gone through 4 or 5 spools of solder, and sometimes I feel like the solder is "sticky" -- in other words it...

I saw a video today of an ESP32 build of an oscilloscope. It looked like a fairly simple project. Has anyone here tried to build an oscilloscope with an Arduino or an ESP32?

I'm not finding LM13600s anywhere and wondering what a good substitution might be.

I originally wasn't going to post a build report about this pedal. It's basically just another tube screamer that I singed another cap while putting it together. However, I learned a few things with this build that I thought might be worth sharing. Lesson 1: First, this thing sounds awesome...