2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers97.7 × 42.6 mm
Blinky Board 555 LED Chaser
pranay-k4/555-LED-ChaserA 555 LED chaser board — a classic beginner PCB project. A custom-designed 555 Timer LED Chaser PCB built using KiCad.
- Size
- 97.7 × 42.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 20
- Pads
- 58
- Tracks, vias
- 210, 12
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Apr 2026
- Updated
- 28 Sep 2026
Overview
Blinky Board 555 LED Chaser is an open-source printed circuit board by pranay-k4, from the pranay-k4/555-LED-Chaser repository on GitHub, published under the MIT licence. It is a 2-layer board of 97.7 × 42.6 mm with 18 parts on 20 nets, routed with 210 tracks and 12 vias.
It is built around the NE555P. Its parts include 8 diodes, 2 capacitors, 2 resistors, 2 ICs and 1 connector.
Main components
1README
README.md555-LED-Chaser
A custom-designed 555 Timer LED Chaser PCB built using KiCad. The board uses a 555 timer to generate clock pulses and a counter IC to create a sequential LED chasing effect.
Features
- Adjustable chase speed using potentiometer
- Two operating modes:
- Sequential LED chaser
- All LEDs ON
- Custom PCB designed in KiCad
- Beginner-friendly electronics project
- Through-hole components for easy assembly
How It Works
The NE555 timer is configured in astable mode to generate periodic clock pulses.These pulses are fed into the counter IC, which activates the LEDs one after another, creating the chasing effect.The potentiometer changes the timing capacitor charging/discharging rate, allowing the user to control the chase speed.
Modes
The mode button selects between:
- Sequential LED Chaser
- All LEDs ON
Building it yourself
- Download the Gerber files.
- Manufacture the PCB.
- Purchase components using the BOM.
- Solder all components.
- Apply power.
- Adjust speed using the potentiometer.
- Change modes using the push button.
Schematics -
PCB design -
Final 3D design -
Images:
Demo Video
Youtube link: here
Part of Hack Club's Stasis Event
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 4017 | Package_DIP:DIP-16_W7.62mm | U2 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 50k | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV1 |
| 1 | C | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2 |
| 1 | C_Polarized | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1 |
| 1 | Conn_01x02_Socket | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J1 |
| 1 | LOGO | Graphics:22221 | G*** |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | SW_SPDT | Button_Switch_THT:SW_Slide_SPDT_Straight_CK_OS102011MS2Q | SW1 |
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Questions
How big is the Blinky Board 555 LED Chaser PCB?
It measures 97.7 × 42.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Blinky Board 555 LED Chaser use?
18 parts, built around the NE555P. 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 Blinky Board 555 LED Chaser KiCad files?
From the pranay-k4/555-LED-Chaser repository on GitHub, at the commit this page was made from: the board is hardware/Blinky Board 555 LED Chaser.kicad_pcb and its schematic hardware/Blinky Board 555 LED Chaser.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Blinky Board 555 LED Chaser design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).