First up for DIY projects is a favorite around here, the Colorsound Supa Tonebender. It's a Big Muff Pi variant sold under the "Colorsound" brand and distributed by the UK company in the 1970s. The difference between a standard Big Muff and a Supa Tonebender is the removal of the first two clipping diodes and a coupling cap. Seriously, that's it. The resulting sound is louder with tons of thick distortion, much in the same area as a Big Muff, maybe a little less fuzzy, more of a distortion than a fuzz, imo, but still completely over the top. Much more low end than a standard Big Muff. (GREAT on Bass and Keys)
Professionally fabricated double sided printed circuit boards are available for $5 each.
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Current Stock: SOLD OUT - Restock Coming 8/1/2019
The build below is in a 1590BBM enclosure from Mammoth Electronics. The layout is pretty loose and that's on purpose. The intention was to allow some flexibility with part selection. The hole in the center(1/4") fits the plastic adhesive backed PCB standoffs that are sold on various DIY sites. I see them listed on eBay too. Everything terminates to the PCB, again to accomodate whatever hardware is available.