This is my first time trying anything like this, and first post here, so correct me if anything seems iffy.
My bassist brother had a Snarling Dogs Bootzilla fuzz/wah laying around collecting dust, so I bought it off him to see if I could mod it. I looked around online, saw next to nothing on anything that wasn't the Mold Spore or Whine-oh, so I figured I had a duty to post this thing up. From the Factory:
I liked the wah sound - the hi and mid range wah settings work pretty well on guitar. But I was mostly in this pedal trying to score some cheap fuzz.
It sounded terrible to start with - all the highs and mids are filtered down heavily. This pedal was obviously designed for one note, totally fuzzed basslines. But the actual breakup sounded pretty ok. Teardown:
I started off by tearing it open, and checking out the guts:
The fuzz section is at the top of the board, wah at the bottom. The board and wires seem kinda cheap, but not horrible. Knobs and switches attach via those white connectors, so the board is pretty easy to get out of the housing, and knobs/switches would be super easy to replace.
MC1458N dual-op amp in the middle there.
The I got to work drawing up a schematic of the fuzz section.
This is the back of the board - image flipped horizontally so I could check back and forth between the pedal and the picture without having to keep rearranging components in my brain.
I ended up with this schematic. No guarantees that it's even close to correct (this is my first time doing this, any input would be appreciated) but it seems really straightforward. Also, given my lack of experience here, I wouldn't be surprised if this was actually some super common circuit that I didn't recognize because of the goofy layout of my schematic.
Ca and Ra are notated to match the labels assigned on the other side of the board. Mods:
So the most obvious thing to me was that massive input cap - labeled 2A224K. That is 220 microF right?
Anyway, I went ahead and replaced it with a cap in the pico-farad range (I don't exactly remember what I threw in but it was between .5 and 5 pF) - and now it sounds awesome! Response is still a lot of rolled off treble, but still some note definition in the highs as it gets fuzzy. Breakup is quick, but I've got this pedal following a Damage Control Demonizer set to just a bit of drive with a decent amount of compression. I'll get a recording up in the next couple days.
Future work may be to replace those LEDs with some stacked silicon diodes for smoother breakup (I think, based on what I've read online?). I may also play with Ca9 to mess with the filtering around the fuzz a bit more.
So, anything else anyone wants to see/know about the pedal before I get a recording up? Any other thoughts on modding it? Anybody else played with one before?