BD2 Mods
About the BD2 Mods PCB
BD2 Mods is an open source PCB design by Network-Direction, published on GitHub. It is a 2-layer board measuring 51 × 61.3 mm, with 67 components from 40 distinct parts.
Other key parts include the TL072 and TL074. By type, the board carries 26 capacitors, 25 resistors, 7 diodes, 2 ICs, 2 transistors and 2 connectors.
It belongs with the audio designs in this gallery.
From the project
Guitar pedal schematics and resources
The gyrator section uses 56nF capacitors in the original circuit. This version adds the option to replace with the 47nF or 68nF caps. However, this might slightly reduce or increase the filtering.
Main components on the BD2 Mods
BD2 Mods bill of materials (BOM)
67 components, 40 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TL072 | DIP-8_W7.62mm | U1 |
| 1 | TL074 | DIP-14_W7.62mm | U2 |
| 1 | BC547B BC547 | TO-92_Inline_Wide | Q1 |
| 1 | BC547 | TO-92_Inline_Wide | Q2 |
| 1 | +9v | PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | PCB | PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | B100K | PinHeader_1x06_P2.54mm_Vertical | RV1 |
| 1 | 10KB B10K | PinHeader_1x03_P2.54mm_Vertical | RV3 |
| 1 | 100KA A100K | PinHeader_1x03_P2.54mm_Vertical | RV4 |
| 4 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D6 |
| 3 | LED | LED_D5.0mm | D4, D5, D7 |
| 2 | 100UF 100uF | CP_Radial_D6.3mm_P2.50mm | C1, C4 |
| 4 | 100NF 100nF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C2, C6, C7, C11 |
| 2 | 47UF 47uF | CP_Radial_D5.0mm_P2.00mm | C3, C5 |
| 1 | 150NF 150nF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C8 |
| 1 | 47PF 47pF | C_Disc_D5.1mm_W3.2mm_P5.00mm | C9 |
| 1 | 220PF 220pF | C_Disc_D5.1mm_W3.2mm_P5.00mm | C10 |
| 3 | 47NF 47nF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C12, C20, C21 |
| 1 | 1NF 1nF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C13 |
| 2 | 2.2NF 2.2nF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C14, C22 |
Show 20 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1UF 1uF | CP_Radial_D4.0mm_P1.50mm | C15 |
| 1 | 100PF 100pF | C_Disc_D5.1mm_W3.2mm_P5.00mm | C16 |
| 3 | 10NF 10nF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C17, C18, C19 |
| 2 | 56NF 56nF | C_Rect_L7.5mm_W6.5mm_P5.00mm | C23, C24 |
| 2 | 1UF 1uF | C_Rect_L7.0mm_W6.0mm_P5.00mm | C25, C26 |
| 3 | 2K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R9, R17 |
| 4 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3, R4, R21 |
| 3 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R13, R14 |
| 1 | 220K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 2 | 22K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7, R8 |
| 2 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R28 |
| 1 | 330K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | 15K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
| 1 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15 |
| 1 | 33K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16 |
| 1 | 5K6 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R18 |
| 2 | 470K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R19, R22 |
| 1 | 6K8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R20 |
| 1 | 3K6 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R23 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R30 |
BD2 Mods design files
The KiCad project lives in the Network-Direction/Audio-Effect-Pedals repository on GitHub; these links point at the commit this page was built from.
BD2 Mods: common questions
How big is the BD2 Mods PCB?
The BD2 Mods measures 51 × 61.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the BD2 Mods?
67 components, from 40 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 BD2 Mods design files?
From the Network-Direction/Audio-Effect-Pedals 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 BD2 Mods design in my own project?
The repository has no license, so all rights stay with Network-Direction. Use it as a reference, and ask the author before reusing the design.
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