The Earthquaker Devices Spires green channel is a variation of one of my favourite fuzz circuits - the Rosac Nufuzz. It's a progression of a fuzzrite from the original designer, but it has a tone control on the output sweeping between a small and large cap to provide a thin to thick fuzz sound. There's no fuzz control, it's set to full all the time.
I used an old layout from the D*A*M FR-70 to adapt for this, as it's almost the same. I skipped the 10k resistor on the input for this reason. Could always squeeze one in if you wanted it.
Schematic located here on Pedal PCB and if you're wondering about the other channel on Spires (the red one), it's a silicon fuzz face. It probably has some tweaks, but you get the idea.
EARTHQUAKER DEVICES SPIRES GREEN CHANNEL - 0.15" VERO LAYOUT
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