I thought I'd throw this up since I didn't get any hits here and I finally found the zine ("101 Electronic Projects") it's in. This thing was included in the 1972 edition, the 1973 edition and the 1974 edition (slightly renamed "Fancy Guitar Fuzzbox").
It uses a couple germanium pnp's
I "cleaned" up the schematic and breadboarded this a while ago
It was cool, but I didn't spend enough time to get it to the point where it was worth boxing.
So, I breaded it again. I used some "standard" FZ-1A compatible transistors since it does resemble the 2nd and 3rd stages of that....used Q1 ~ 75 hfe, leak ~ 150uA and Q2 ~ 120 hfe, leak ~ 320uA
I got a good fuzz right off, though nothing like an FZ-1A. It's fatter and heavier. Q1C/Q2C voltages ~ -1.1V and -1.2V respectively.
A couple notes: definitely screw with different leakages in Q2. Just like many fuzzes with this structure, it's biased by leakage....and screw with the 1M on Q1 and 22K /10K on Q2 to tune it where you like it best.
The stock values gave me a good fuzz right off, but with slight gating and a swell. Increasing the 1M to 1.5M got rid of that, but also increases the bass response a bit. The 100K was too small of a "cutoff"...it's too dead there. I needed something in the 200K-300K range.
The 22K /10K on Q2 were pretty damn close, also. For example, I tuned the 22K by ear and got 28K for the best.
That was just my first shot. I'll definitely be experimenting with many other transistors and leakages, especially for Q2.
Fancy Fuzzbox - 1972
- LucifersTrip
- Resistor Ronker
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