2 layers75.6 × 64.1 mm
2 layers35 × 50 mm
Switcher
rickwargo/CATSAn ESP32 system to add some spark into my '00 Z3M
- Size
- 35 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 21
- Pads
- 57
- Tracks, vias
- 89, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Sep 2026
- Updated
- 26 Sep 2026
Overview
Switcher is an open-source printed circuit board by rickwargo, from the rickwargo/CATS repository on GitHub. It is a 2-layer board of 35 × 50 mm with 19 parts on 21 nets, routed with 89 tracks and 0 vias.
It is built around the BC337. Its parts include 8 resistors, 6 ICs, 4 transistors and 1 connector.
Main components
1Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100K | Resistor_SMD:R_1206_3216Metric | R1, R2, R3, R4 |
| 4 | 2K2 | Resistor_SMD:R_1206_3216Metric | R5, R6, R7, R8 |
| 4 | 34.81-7048 | OptoDevice:Finder_34.81 | U1, U2, U3, U4 |
| 4 | BC337 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q2, Q3, Q4 |
| 1 | 3.3V Power | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | U6 |
| 1 | Conn_01x04_Socket | Connector_JST:JST_XH_B5B-XH-A_1x05_P2.50mm_Vertical | J1 |
| 1 | GPIO Block | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | U5 |
Questions
How big is the Switcher PCB?
It measures 35 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Switcher use?
19 parts, built around the BC337. 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.
Where can I download the Switcher KiCad files?
From the rickwargo/CATS repository on GitHub, at the commit this page was made from: the board is Blower Switch/Switcher.kicad_pcb and its schematic Blower Switch/Switcher.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Switcher design in my own project?
Its repository states no licence, so its author keeps all rights: ask rickwargo before reusing the design.
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