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This is an excellent crystal clear boost. Overview & Sonic Impressions Of the boosts I have built and others I have messed around with, I give this one high marks. On its own, it can get you serious headroom, and placed before an overdrive pedal it absolutely shines. It has plenty volume and...

It was an easy build and everything fit nicely. One odd sized 180n cap - I had it. I used a matte yellow - perhaps sulfur-yellow enclosure with a film free decal and 2k matte clear. The film free is tricky on this textured enclosure and I hope I will get better at using film-free on this type. I...

I like overdrive with options, (switches and knobs) and I like most Wampler pedals. The switch on this one makes subtle changes to tone. I prefer the switch set at "Linked". From what I read: Link mimics the old-school technique of "jumping" or "bridging" the inputs on a vintage 1950s Fender...

I think it is a great OD pedal as a standalone or to tone stack. It is an easy build that only takes a few hours. After waterslide I used SprayMax 2k matte clear. It is a waterslide decal and in person it appears a bit blotchy in spots. Sadly the film-free does not lay down as well with these...

I had to build this circuit because I love my Wampler Plexi and I enjoy most of Wampler's offerings. I usually like the various "Marshall-in-a-box (MIAB) overdrive and distortion pedals. It is an easy build and the end result of the build is very smooth OD that can switch to aggressive harmonic...

I think it is a good time to pause at 100 completed pedals. I will have to keep this pedal because it is a milestone for me and a marker on my pedal building journey. I have many to thank for helping me in this hobby. This pedal has a film-free decal so I have to thank the @Guardians of the...

We have a PCB we call "Fumble". I checked for JHS trademarks related to their "Fumble" drive - while not a currently trademarked by JHS, a trademark application is on file since February 2026. So I am not sure about our ability to use word "Fumble".

Decided to complete two squidwards. If you stack a squidward with your overdrive you get some great harmonic overdrive. I made one of these a while ago and gave it to the bass playing kid at my local music store. After that I bought a couple more pcbs. They are fun to build and easy to fit in...

Many people love this circuit and I guess I sort of do also– PPCB site reviews. The Mach 1 is a decent overdrive pedal that is not overpowered but has headroom. I can get it to sound like crunchy overdrive and I can get transparency – If I crank the drive it becomes a compressed distortion...

You can hit a note and it will just roll distortion out forever; it is aggressive and compressed. Whenever I have an overdrive/dfzz/distortion pedal I like to roll the gain down to zero to see if I can get any useable overdrive without the rolling distortion. With this circuit, it cleans up some...

Not sure if it is a big deal but the actual PCB board is different than the image on the website

I am happy with the aesthetic and the build. It is attractive to me and functions great. This is a dirt pedal: extreme dirt or moderate dirt with no ability to get clean or even semi-clean overdrive by rolling off gain or adjusting tone controls. I do not find versatility in such a pedal and the...

No mods. It is a dirt pedal, and it can get filthy. The cut is interesting; I like it near 9 o'clock... if you turn it towards 3 o'clock it muffles and cuts highs. This circuit in not overpowered like others I have built but it has some headroom. The build gets rave reviews on the PPCB site. I...

I tried this circuit with the D9E Ge and a 5mm red diffused LED and the sound was glorious. I love this circuit and that is why I keep building it. I love that the PPCB board is small and has very few components yet the sound is full-on. The LED seems to make it a little lower-toned and...

This is pedal number 82 for me and the second Robin Trower OD I have built. It is very creamy with a distinct-mids-tone. I enjoy the overdrive that this pedal produces, but for me I want to go to a lower tone which I do not think I can get with this pedal. This is more creamy Tube Screamer than...

Great pedal. This is the second one I have built and this time I tried to pay homage to the original. I did deviate from build docs, by putting an 18k in R4 and I also made the dwell potentiometer a B25k. I love the sound and yes I am a fan of the Belton brick. For the enclosure it is a Love My...

Glorious overdrive. The toggle up puts this thing into Plexi territory; switch down and it you get lower tones. The pedal itself has no op amp, just some J201s that I sourced from PPCB. I used the Lumberg jacks and a top jack PPCB faceplate. I am a fan of most Wampler pedals and I can say this...

The pedal has only four potentiometers but the build documents call for 5.

These dimensions may be incorrect based on the image.

If you were thinking of building one of these just don’t. After building a couple of these, I can tell you they’re just not great. My only snafu in this build was using a 2N5485 that was no good. Grr. Picture below for posterity. Because I built one of these already I know that the build docs...