2 layers18.5 × 11.1 mm
Switch
byrantech/laptop
anyon_e, a highly integrated, high end, open source laptop. Attempt the impossible.
6 parts4.3kMIT
2 layers55.9 × 30.5 mm
Transistor LED Control PCB
theharshaG/Transistor-Control-PCBThis project demonstrates how to control an LED using an NPN transistor as a switch.
- Size
- 55.9 × 30.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 6
- Nets
- 6
- Pads
- 15
- Tracks, vias
- 21, 0
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 3 May 2026
- Updated
- 3 May 2026
Overview
Transistor LED Control PCB is an open-source printed circuit board by theharshaG, from the theharshaG/Transistor-Control-PCB repository on GitHub. It is a 2-layer board of 55.9 × 30.5 mm with 6 parts on 6 nets, routed with 21 tracks and 0 vias.
Its parts include 2 resistors, 1 diode, 1 transistor and 1 switch.
README
README.mdTransistor-Control-PCB
Transistor LED Control PCB (KiCad)
Description
This project demonstrates how to control an LED using an NPN transistor as a switch.
Components
- NPN Transistor (BC547 / 2N2222)
- LED
- Resistors (1k)
- Push Button
- Connector
Concept
A transistor is used as a switch:
- Button provides base signal
- Transistor turns ON
- LED glows
Output
Schematic
PCB Layout
3D View
Tool
KiCad
Parts
6| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2 |
| 1 | GND | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | VCC |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | Q_NPN_BCE | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
Questions
How big is the Transistor LED Control PCB PCB?
It measures 55.9 × 30.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Transistor LED Control PCB use?
6 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.
Where can I download the Transistor LED Control PCB KiCad files?
From the theharshaG/Transistor-Control-PCB repository on GitHub, at the commit this page was made from: the board is Transistor_LED_Control_PCB.kicad_pcb and its schematic Transistor_LED_Control_PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Transistor LED Control PCB design in my own project?
Its repository states no licence, so its author keeps all rights: ask theharshaG before reusing the design.
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