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The Skreddy Pedals™ BC109 FUZZ is made from silicon transistors for power and temperature stability, but it's darkened so you can get germanium-ish effects out of it too.
The 2 transistors are piggybacked for better tone (smoother, lower noise than single transistors), giving this circuit 4 transistors total.
The extra controls let you emulate different classic fuzz tones from the 60's and early 70's along with improvements for some of the issues those early fuzzes had (noise reduction, adjustable tone, and input impedance selector switch).
This can be a rude, biting fuzz or a creamy-sounding fuzz or a fizzy, nasty velcro fuzz, depending on how you set it up. If you want good guitar-volume clean up, turn the bias up high. If you want 60's style mayhem, turn it down low.
No special power requirements, just regular negative ground 9v.