2 layers83.3 × 65.3 mm
SimonShield
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46 parts14kMIT
2 layers50 × 50 mm
Transistor Driver
Rorchive/E05Analog DC Motor Driver (BC547 + 5V Relay). Hardware project designed in KiCad for Inatel's E05 analog electronics class.
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 8
- Pads
- 24
- Tracks, vias
- 23, 0
- Pours
- 22
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 17 Jun 2026
- Updated
- 19 Jun 2026
Overview
Transistor Driver is an open-source printed circuit board by Rorchive, from the Rorchive/E05 repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 50 × 50 mm with 11 parts on 8 nets, routed with 23 tracks and 0 vias.
It is built around the BC547. Its parts include 3 resistors, 3 connectors, 2 diodes, 2 switches and 1 transistor. It belongs with the robots and motor control boards of this library.
Main components
1README
README.mdE05 - Motor Driver
Overview • Repository Organization • Releases • License
Overview
This project involves the development of a DC Motor Driver module tailored for the E05 (Transistorized Analog Electronics) course at Inatel. The system is engineered to handle electromechanical switching using a purely analog architecture, providing robust motor control based on a BC547 NPN transistor acting as a driver for a 5V SPDT relay (Songle SRD series). The hardware design incorporates inductive spike protection via a 1N5408 flyback diode, input state stabilization through a push-button with a pull-down network, and real-time visual feedback via an LED indicator.
Repository Organization
docs: Technical documentation and datasheets.hardware: Core hardware files.3D: 3D models (.step).Fabrication: BOM and Gerber files for JLCPCB manufacturing.PCB: KiCad schematics and layout design.
Releases
| Render | Board Name | Status | Latest Release | Date | Datasheet | BOM | Ordering Info |
|---|---|---|---|---|---|---|---|
| Motor Driver v1 | ✅ Released | v1r2 | 2026-06-19 | No | GERBER (JLCPCB) |
Circuit Operation
Figure (a) illustrates the driver module in its active state with the relay energized (latched) and the LED status indicator turned on while the push-button is pressed, completing the circuit to power the DC motor. Figure (b) depicts the circuit in its default idle state (relay de-energized) with no input applied to the button.
Figure 1: Side-by-side comparison of the mechanical mounting system: (a) Engaged state, (b) Disengaged state.
License
This project is licensed under the weakly-reciprocal CERN-OHL-W-2.0 open-hardware license. You are free to modify and distribute these files, provided downstream hardware design modifications remain under the same terms.
📜 This project is part of Rorchive, my personal archive of activities and courses developed during my undergraduate studies at Inatel.
Built with ❤️ by Rodrigo Andrade
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 10k | Transistor_Driver-Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 1N5408 | Transistor_Driver-Footprints:D_DO-201AD_P15.24mm_Horizontal | D1 |
| 1 | 1k | Transistor_Driver-Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 220 | Transistor_Driver-Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | BC547 | Transistor_Driver-Footprints:TO-92_Inline_Wide | Q1 |
| 1 | Conn_5V | Transistor_Driver-Footprints:PinHeader_1x01_P2.54mm_Vertical | J1 |
| 1 | Conn_GND | Transistor_Driver-Footprints:PinHeader_1x01_P2.54mm_Vertical | J2 |
| 1 | G5LE-1 | Transistor_Driver-Footprints:Relay_SPDT_Omron-G5LE-1 | K1 |
| 1 | LED RED | Transistor_Driver-Footprints:LED_D3.0mm_Clear | D2 |
| 1 | PS1024ALRED | Transistor_Driver-Footprints:SW_PS1024ALRED | S1 |
| 1 | Power_Output | Transistor_Driver-Footprints:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J3 |
Questions
How big is the Transistor Driver PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Transistor Driver use?
11 parts, built around the BC547. 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 Transistor Driver KiCad files?
From the Rorchive/E05 repository on GitHub, at the commit this page was made from: the board is hardware/PCB/Transistor_Driver.kicad_pcb and its schematic hardware/PCB/Transistor_Driver.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Transistor Driver design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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