Outdatedcandy92/Pedalboard2Modern guitar pedals such as the DS-1 and Big Muff Pi are super expensive!! and the new pedals that are being produced all have SMD components which make it harder to mod and repair.
Big Muff is an open-source printed circuit board by Outdatedcandy92, from the Outdatedcandy92/Pedalboard repository on GitHub. It is a 2-layer board of 45 × 45 mm with 49 parts on 28 nets, routed with 137 tracks and 381 vias.
Its parts include 22 resistors, 13 capacitors, 4 diodes, 4 transistors and 3 connectors.
This project aims to create a DIY friendly and Mod-able version of the iconic Boss DS-1 and Big Muff Pi.
Modern guitar pedals such as the DS-1 and Big Muff Pi are super expensive!! and the new pedals that are being produced all have SMD components which make it harder to mod and repair. I always wanted to get a DS-1 but its price tag really put me off, so I did a bit of research and found a really good circuit analysis of the DS-1 on ElectroSmash's Website and decided to create my own DS-1 and it was really rewarding project and the results were also very good. Since my DS-1 Version 1 had really good results, I decided to design an even upgraded version of it which fixes problems in version 1, In addition to that I also created a PCB for the Big Muff Pi.
https://github.com/user-attachments/assets/e87293e5-299d-45d1-807d-6a7f5c813e14
https://github.com/user-attachments/assets/bea94fd8-728a-4ede-ab68-e8244417e8f7
DS-1 PCB
Big Muff PCB
More detailed BOM with parts lists is under the src folder
| Reference | Value / Part Number |
|---|---|
| C1, C3 | 47n |
| C2, C8, C9 | 0.47µF |
| C4 | 250pF |
| C5 | 68n |
| C7 | 100pF |
| C10 | 0.01µF |
| C11 | 0.022µF |
| C12 | 0.1µF |
| C13 | 0.047µF |
| C14 | 1µF |
| C15 | 47µF |
| C23 | 100µF |
| D1 | 1N4004 |
| D4, D5, D8 | D1N4148 |
| Q1, Q2, Q3 | 2SC2240 |
| R1, R22 | 1K |
| R2, R7 | 470K |
| R3, R8, R18, R21, R24, R25 | 10K |
| R4, R5, R10, R11, R23 | 100K |
| R9 | 22Ω |
| R13 | 4.7K |
| R14, R15 | 2.2K |
| R16, R17 | 6.8K |
| R19, R20 | 1M |
| R39 | 47K |
| U1 | NJM3404A (M5223AL, BA728N equiv.) |
| VR1, VR2 | 100KB |
| VR3 | 20KB |
| J1, J2 | 6.35mm Jacks |
| Component Type | Value / Part Number | Designators |
|---|---|---|
| NPN Transistors | BC239 or 2N5088, 2N5089, BC549C, SE4010, 2N5210 | Q1, Q2, Q3, Q4 |
| Silicon Diodes | 1N914 or 1N4148 | D1, D2, D3, D4 |
| Potentiometers (Lin) | 100K | Sustain, Tone, Volume |
| Resistors | 10K | R13, R19, R18, R11, R12 |
| Resistors | 100K | R20, R16, R3 |
| Resistors | 470K | R9, R17, R15 |
| Resistors | 39K | R2, R8 |
| Resistors | 150 | R21, R10 |
| Resistors | 15K | R6 |
| Resistor | 47K | R14 |
| Resistor | 100 | R22 |
| Resistor | 3.3K | R4 |
| Resistor | 1K | R23 |
| Resistor | 22K | R5 |
| Capacitors | 1µF | C1, C4, C6, C7 |
| Capacitors | 100nF | C5, C13, C3, C2 |
| Capacitors | 470pF | C10, C11, C12 |
| Capacitor | 4nF | C9 |
| Capacitor | 10nF | C8 |
ElectroSmash Boss DS-1 Analysis ElectroSmash Big Muff Pi Analysis
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C2, C3, C5, C13 |
| 4 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R13, R18, R19 |
| 4 | 1N914 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4 |
| 4 | BC239 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q2, Q3, Q4 |
| 3 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R16, R20 |
| 3 | 100K | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-3-2.54_1x03_P2.54mm_Horizontal | SUSTAIN, TONE, VOLUME |
| 3 | 1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, C6, C7 |
| 3 | 470K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9, R15, R17 |
| 3 | 470pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C10, C11, C12 |
| 2 | 150 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R21 |
| 2 | 39K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R8 |
| 2 | Sound | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J2, J3 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R22 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
| 1 | 10nF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C8 |
| 1 | 15K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R23 |
| 1 | 1uF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C4 |
| 1 | 22K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 3K3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 430K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 47K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R14 |
| 1 | 4nF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C9 |
| 1 | Power | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J1 |
Outdatedcandy92/Pedalboard
Modern guitar pedals such as the DS-1 and Big Muff Pi are super expensive!! and the new pedals that are being produced all have SMD components which make it harder to mod and repair.
benkrasnow/DSKY_EL_replica
Schematic, PCB layout, mechanical CAD, and firmware to create a replica of the DSKY with electroluminescent display
It measures 45 × 45 mm and has 2 copper layers, 1.6 mm thick.
49 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the Outdatedcandy92/Pedalboard repository on GitHub, at the commit this page was made from: the board is src/Big Muff Pi/KiCad/Big_Muff.kicad_pcb and its schematic src/3PDT/KiCad/ProPrj_Test_2025-06-08.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask Outdatedcandy92 before reusing the design.