HagFace Fuzz - PCB Kit
The HAGFACE is a modified and corrected version of the classic two-transistor Fuzz-Face. Although this legendary circuit is brilliantly simple and sounds wonderful, it has a few drawbacks – notably low input impedance and sensitivity to transistor gain. Over the years people have attempted various improvements such as transistor sorting and adjustable biasing, but these are band-aids and only go so far. HAGFACE tackles both problems by adding R5, R6 and R10; improving low-level linearity, bias stability, and increasing input impedance by a factor of ten. Virtually any set of NPN transistors can be used without a shift in bias! And you no longer have to put this pedal first in the chain, as most other pedals should be able to drive it. Improving the circuit further, I added a buffered TONE control and an auto-LED circuit, which flashes intensity in proportion to fuzz. The warm, asymmetrical clipping and range of tones of the original are preserved.
The PCB kit includes a blank circuit board and most of the parts that solder to it (plus wire, feet, and a label). You will need to separately purchase the remaining components (enclosure, foot-switch, LED, jacks, pots, knobs). Parts list is included in manual below.
- True bypass
- 24dB maximum gain
- 10mV input, onset of clipping