2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers71.9 × 98.4 mm
Led chaser
Adium1000/LED-CHASER-PCBA simple 10-LED chaser circuit built around two classic ICs: the NE555 timer and the CD4017 decade counter.
- Size
- 71.9 × 98.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 18
- Pads
- 57
- Tracks, vias
- 192, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Jan 2026
- Updated
- 5 Sep 2026
Overview
Led chaser is an open-source printed circuit board by Adium1000, from the Adium1000/LED-CHASER-PCB repository on GitHub. It is a 2-layer board of 71.9 × 98.4 mm with 19 parts on 18 nets, routed with 192 tracks and 0 vias.
It is built around the NE555P. Its parts include 10 diodes, 2 capacitors, 2 resistors and 2 ICs.
Main components
1README
README.mdLED Chaser
A simple 10-LED chaser circuit built around two classic ICs: the NE555 timer and the CD4017 decade counter.
The NE555 generates the clock signal, while the CD4017 uses that signal to drive the LEDs one after another, creating the classic LED chaser effect.
Samples
How It Works
The circuit is based on two main ICs:
- NE555P: configured as an astable oscillator to generate the clock signal
- CD4017: counts the clock pulses and activates each output sequentially
A potentiometer is used to adjust the frequency of the 555 timer, allowing you to control how fast the LEDs chase each other.
Bill of Materials
| Quantity | Component |
|---|---|
| 10 | 3mm LEDs |
| 1 | 50kΩ Potentiometer |
| 1 | 470Ω Resistor |
| 1 | 1kΩ Resistor |
| 1 | 0.01µF Capacitor |
| 1 | 1µF Capacitor |
| 1 | CD4017 IC |
| 1 | NE555P IC |
Features
- 10 sequential LEDs
- Adjustable chase speed
- Simple through-hole design
- Built using widely available components
- Great beginner electronics project
- Custom PCB design
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | LED | LED_THT:LED_D3.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 |
| 2 | MountingHole_Pad | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | 5V, GND |
| 1 | 0.01 uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1 0.01 uF |
| 1 | 1 uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C2 1uF |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 4017 | IC:N16 | U1 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 470 Ohm |
| 1 | 50K | Potentiometer_THT:Potentiometer_Bourns_3296Y_Vertical | RV1 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U2 |
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Questions
How big is the Led chaser PCB?
It measures 71.9 × 98.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Led chaser use?
19 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 Led chaser KiCad files?
From the Adium1000/LED-CHASER-PCB repository on GitHub, at the commit this page was made from: the board is PCB/led chaser.kicad_pcb and its schematic PCB/led chaser.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Led chaser design in my own project?
Its repository states no licence, so its author keeps all rights: ask Adium1000 before reusing the design.