Thanks a lot man! Ahahaha that battery always draws attention when I show it on pictures. It’s a really cheap Chinese battery that comes in lots of Brazilian toys, but they are the Carbon kind, so it’s kind of a Mojo thing
There is a LOT of info about this circuit condensed here, https://vero-p2p.blogspot.com/2022/12/zonk-machine-component-values-table.html
And this is a rare case of a pedal which isn’t really “paint by numbers”. I tried to make one using different brand transistors with the same hFE/leakage for...
Hey @Mark, the enclosure is from @mwpedalparts-maggie, really great stuff. The artwork is silk screened to the enclosure. As for the transistors, it doesn’t really exist a formula (as you can see from the wide range of gain/hFE used on originals). You need to have the sound on your head and swap...
I really recommend it! But don’t use a transistor pair you would use in a fuzz face, it needs lots of leakage to sound as a real deal MKI.5. You want low gain and high leakage! Check the voltages online
I’ll record something later, but the transistors read really close to the real deal, Q1 hFE 33, leakage close to 0, q2 hFE 55, leakage in the 80-100s, Q3 hFE 200, leakage around 180 (all measured yesterday, a cold day around here)
Here is another mojo-tastic build. Used a pair of Tungsram AC128 for this - I hate this transistor on Fuzz Faces, but sounds great on a I.5!
And a short video showing its clean up:
I made a project for a smaller sized wedge enclosure with the jacks on the same profile as the other hardware and board goes, because I was always annoyed with wiring floating between the two parts of the regular Bender/Zonk enclosure. For the circuit I used a vintage specs stripboard I got made...