Rohmell
About the Rohmell PCB
Rohmell is an open source PCB design by MBI-Ignitions, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 38.9 × 47.2 mm, with 27 components from 25 distinct parts.
By type, the board carries 9 resistors, 5 jumpers, 5 diodes, 5 capacitors, 2 connectors and 1 transistor.
From the project
Repository for uploading ignition system information
Some designs also have themistors or thermal resistors. These are to change the timing depending the ambient temperature.
Rohmell bill of materials (BOM)
27 components, 25 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TIC106 | TO-220-3_Vertical | Q1 |
| 1 | MAG | SolderWire-2.5sqmm_1x02_P7.2mm_D2.4mm_OD3.6mm | J6 |
| 1 | COIL | SolderWire-2.5sqmm_1x02_P7.2mm_D2.4mm_OD3.6mm | J7 |
| 1 | JP1 | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | JP2 | PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | JP3 | PinHeader_1x02_P2.54mm_Vertical | JP3 |
| 1 | JP4 | PinHeader_1x03_P2.54mm_Vertical | JP4 |
| 1 | JP5 | PinHeader_1x03_P2.54mm_Vertical | JP5 |
| 2 | 1N4007 | D_DO-41_SOD81_P7.62mm_Horizontal | D1, D4 |
| 1 | SA5.0A-TP 1N4007 | D_DO-41_SOD81_P7.62mm_Horizontal | D2 |
| 1 | 1N5819 1N4007 | D_DO-41_SOD81_P7.62mm_Horizontal | D3 |
| 1 | 1N4007 | D_DO-41_SOD81_P7.62mm_Horizontal | D5 |
| 1 | 10U 4.7u 35v | CP_Radial_Tantal_D5.5mm_P5.00mm | C1 |
| 2 | 0.47u 35v | CP_Radial_Tantal_D5.5mm_P5.00mm | C2, C3 |
| 1 | 0.47u 275 VAC | C_Rect_L26.5mm_W10.5mm_P22.50mm_MKS4 | C4 |
| 1 | 10N 0.47u 275 VAC | C_Rect_L26.5mm_W10.5mm_P22.50mm_MKS4 | C5 |
| 1 | 16 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 27 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 120 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 470 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 220 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 220 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 220 390 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | 33 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 760 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
Rohmell design files
The KiCad project lives in the MBI-Ignitions/MBI_Ignition_Systems repository on GitHub; these links point at the commit this page was built from.
Rohmell: common questions
How big is the Rohmell PCB?
The Rohmell measures 38.9 × 47.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Rohmell?
27 components, from 25 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 Rohmell design files?
From the MBI-Ignitions/MBI_Ignition_Systems 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 Rohmell design in my own project?
Yes, under the terms of its GPL-3.0 license, which MBI-Ignitions chose for the repository.
