Mr. Smiley - A Fuzz Face Clone
December 2, 2022
The fuzz face is one of the most famous guitar pedals of all time, going back to the good ol' Jimi Hendrix. I wanted to try and set out to make this circuit for my self. This was also my first foray into PCB fabrication and all the parts that surround that.
For the schematic itself, I used a circuit from Beavis Audio that is based on the classic Dallas Arbiter Fuzz Face. This specific schematic uses NPN transistors, but I know some other designs use PNP transistors. The only switch I made is instead of using BC108 transistors, I opted for 2N3904's since I had them on hand and I wanted to see what difference they would make (though the circuit works for any NPN transistor, so I may try making a version that allows you to swap between different types).
I started out by just making a stripboard version to make sure the circuit worked and get a sense of what the build was like. I went ahead and mounted this in a custom case I made in the style of the classic round, "smiley" fuzz faces. Once I was finished with that, I went ahead and started working on the PCB design. I used KiCad for all of my schematic and PCB fabrication in this project. There was quite a learning curve with this for me as it was not something I had done before, but luckily this was part of an assignment for a class so I had help from my professor in getting started with the software.
After double and triple checking everything, I sent the files off to be fabricated (in purple of course). Once the boards arrived, I just whipped up a quick case for it in TinkerCad. Then I printed the case, soldered everything, and mounted it all. When making the PCB, I wanted to go for a smaller and rectangular design, but this could easily fit in the bigger circle enclosure if preferred.
Overall, I'm happy with how this project all worked out. I was able to really get started with PCB fabrication, get even more practice with designing enclosures, and got a pretty sick fuzz out of it too. In the future if I want to make some improvements, I definitely see some areas I could work on. First, I would want to try and work on the PCB design itself. I think I could make the design much more compact and I could also make it much more easily mountable in a case. I think I was just a little timid for my first go-through since I really didn't want to mess anything up. I would also like to try out the different transistors, like I said earlier, and see what the big difference between different types would be. Maybe there's a perfect soulmate transistor just out there waiting for me. But in the end, this one gets a big stamp of approval from me.