Mister fuzz
About the Mister fuzz PCB
Mister fuzz is an open source PCB design by nickmedina5991, published on GitHub under the MIT license. It is a 2-layer board measuring 40.5 × 36.1 mm, with 17 components from 16 distinct parts.
By type, the board carries 4 connectors, 4 capacitors, 4 resistors, 2 transistors and 2 diodes.
It belongs with the audio designs in this gallery.
From the project
Custom Designed Guitar Effects Pedal - Silicon NPN Fuzz Face. Simulated in LTSpice and created in KiCad
A silicon Fuzz Face guitar effects pedal designed end-to-end: LTSpice simulation, breadboard prototype, custom KiCad PCB, and a custom Fusion 360 enclosure.
A classic Fuzz Face circuit rebuilt with modern 2N3904 NPN silicon transistors instead of the original 1960s germanium PNPs. The substitution required re-deriving the bias network for silicon's higher hFE, since the original 8.2kΩ bias resistor leaves Q2's collector at the wrong operating point with modern transistors. The production design uses a 10kΩ trim pot in place of the fixed resistor, so each build can be tuned to the specific…
Mister fuzz bill of materials (BOM)
17 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 2N3904 | TO-92_Inline_Wide | Q1, Q2 |
| 1 | IN | PinHeader_1x01_P2.00mm_Vertical | J1 |
| 1 | OUT | PinHeader_1x01_P2.00mm_Vertical | J2 |
| 1 | DC | PinHeader_1x02_P2.00mm_Vertical | J3 |
| 1 | LED- | PinHeader_1x01_P2.00mm_Vertical | J4 |
| 1 | B1K | Potentiometer_Alps_RK163_Single_Horizontal | RV1 |
| 1 | LED | LED_D3.0mm | D1 |
| 1 | 1N4001 | D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | 2.2U 2.2u | CP_Radial_D5.0mm_P2.50mm | C1 |
| 1 | 22U 22u | CP_Radial_D5.0mm_P2.50mm | C2 |
| 1 | 0.01U 0.01u | C_Disc_D5.0mm_W2.5mm_P5.00mm | C3 |
| 1 | 47U 47u | CP_Radial_D5.0mm_P2.50mm | C4 |
| 1 | 33K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 4.7K 4.7k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
Mister fuzz design files
The KiCad project lives in the nickmedina5991/mister-fuzz repository on GitHub; these links point at the commit this page was built from.
- Layouthardware/fuzzface.kicad_pcb
- Schematichardware/fuzzface.kicad_sch
- BOMhardware/bom.csv
Mister fuzz: common questions
How big is the Mister fuzz PCB?
The Mister fuzz measures 40.5 × 36.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mister fuzz?
17 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Mister fuzz design files?
From the nickmedina5991/mister-fuzz repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Mister fuzz design in my own project?
Yes, under the terms of its MIT license, which nickmedina5991 chose for the repository.
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