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This circuit was inspired by T1redHands' contest entry. Loosely based on the Karma Suture, which in turn is based on the Harmonic Percolator. The main thing I did to be different was use a MOSFET for Q2. This could be built on a PedalPCB Antithesis board (omit R7). Mind the pinouts on the...

I'm feeling a bit nostalgic on this one, my first PedalPCB project from August 2018. I've had a love/hate relationship with the Big Muff for many, many moons. For all it's potential, I've struggled to get one to sound the way I like. Smarter people might say "maybe you're building the wrong...

Did I spell that right? :p I've been thinking about this one for a long time. Glad I finally got around to building it because it sounds really good! I found two schematics on the 'net. One has four knobs: GAIN, BIAS, TONE & LEVEL. The other has six: GAIN, BIAS, BASS, MID, TONE & LEVEL...

I buy from Barry at Guitar PCB all the time, he's a good guy, and I trust that Barry is selling legit parts. Every JFET I have bought from him in the past has met spec. I want to warn you about the BF245s he's advertising as equivalent to J201. First of all, BF245s are not rare. Tayda sells...

Moving on from the CMOS Raincoat, I fiddled the gain on all four stages, deleted the FAT switch and put the TONE control between the last two stages. This is more like a BMP, except the limiting comes from overdriving the CMOS inverters rather than clipping diodes. More dynamic and less...

I've been messin' 'round with some low-noise CD4049s I picked up recently. First I tried the ROG 22/7. Not my jam, mostly because I don't dig the BMP tone. So what do you get when you take all of the diodes and some of the resistors out of a BMP? You get a Raincoat. Not nearly as thick and...

pay this much to an enclosure? https://www.amplifiedparts.com/products/chassis-mod-buzzaround-pre-drilled-hammered-dark-gray

Another design from Steve's contest. BtR did a mash-up of the SHO, a BMP clipping stage and a tone control from the BD-2. You can see his original schematic and write-up here. Did I mention that this design won? I liked the basic circuit, so I tweaked it by removing a few unnecessary...

We held a design contest over in The Breakroom earlier this year. There were a lot of great entries and Gator's OD was one of 'em. It's based on a Timmy, with a toggle switch that allows one to drive the 2nd stage to clipping. which gives it a whole new flavor. This is the design Gator...

Design a pedal circuit using this: It's a Dual-Gang pot with one section C10K and the other section A250K. EG sells 'em. I've picked up a couple dozen when they went on sale. Could be useful for filters, gain controls, LFOs, etc.

Unruly fuzzes are normally not my thing, but I wanted to expand my horizons a bit. So here goes. It fuzzes, it gates, it oscillates, and it's controllable from the guitar. I made a few minor mods to the design I found on Tagboardeffects (yes, I had to trace the Vero). I changed: D1, which...

You can read about this on Runoff Groove. A nice OTA-based Phase-Shifter / Vibrato. I built with this four minor mods: 1. I used a TL064 in place of two TL062s. 2. I added a THROB LED. 3. I replaced the back-to-back 10uF caps in the LFO with a pair of 2.2uF film caps in parallel. 4. I ditched...

Phill suggested I check out this circuit. It's a Fender preamp emulator. I built it per the schematic you can find on the Internets, but found the tone to be less than satisfying. One of the things that goes wrong when emulating a tube amp with FETs is headroom. Unless you hit a tube amp...

I've been meaning to breadboard the Phase 90 for a long time. Anyone who has played thru one of these knows about the ethereal, liquid, tone. I recall tracing one of these when I was an engineering student back in 1976. I had read about using JFETs as variable resistors, but this was the first...

This time we'll talk about output characteristics and distortion. Bear with me while I digress a bit and explain class-A, class-B, and push-pull. In the simplest terms, class-A means that the amplifying device, in the case of opamps it's a transistor, is always in conduction. In other words...

This article picks up where the Fat Sandwich article leaves off. Here's what I have at the moment. It's still a work in progress. The Fat Sandwich is kinda like 4 stacked pedals: Clean Boost -> DS-1 -> EQ -> Red Llama. I mainly attacked the EQ section and made the clipping diodes functional...

It's Way Huge! Well, sorta. 5 knobs and only one of them does much of anything, unless you roll the guitar volume down. I'm baffled as to what Jorge Tripps had in mind, unless it's all an elaborate practical joke. Steve picked this one up on eBay, sent it to me, then I tested and traced it...

I really should have listened to the demos first. This thing is so bottom-heavy that Dunlop ought to call it the "Kim Kardashian Fuzz." Humbuckers? Fugeddabouddit! P90s are too thick for this biatch. I tried it with my Tele and the bridge pickup is still too boomy for my tastes. The...

In this chapter, we'll discuss the input characteristics of opamps and how to bias them. In an ideal opamp, 1. The current flowing in or out of the input pins would be zero. 2. The voltage difference between the input pins would be zero when the opamp's output is halfway between the rails. 3...

Anyone know of a Fat Sandwich other than the one on FSB? Some of it doesn't make sense to me. Several of the component values look wrong, especially in the tone network after the opamp.