2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers33.5 × 31 mm
555-timer clock
mohammad-aljumaah/555-clock-moduleThe 555 Clock Module is a small board that produces a steady blinking signal which other circuits can use to keep time or stay in sync. It is built around the classic NE555P chip
- Size
- 33.5 × 31 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 6
- Pads
- 21
- Tracks, vias
- 28, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Jun 2026
- Updated
- 25 Jun 2026
Overview
555-timer clock is an open-source printed circuit board by mohammad-aljumaah, from the mohammad-aljumaah/555-clock-module repository on GitHub, published under the MIT licence. It is a 2-layer board of 33.5 × 31 mm with 9 parts on 6 nets, routed with 28 tracks and 0 vias.
It is built around the NE555P. Its parts include 2 resistors, 1 capacitor, 1 IC and 1 connector. It belongs with the lEDs and displays boards of this library.
Main components
1README
README.md555 Clock Module
Designed by Mohammad Aljumaah · mohammad-aljumaah.me
A simple clock pulse generator built with the NE555P timer IC. Outputs a ~7 Hz square wave. useful for clocking counters, shift registers, and other digital circuits.
Designed from scratch in KiCad. Includes schematic, PCB layout, Gerbers, and a full datasheet.
Specs
| Supply | 5 V DC |
| Output | ~7 Hz square wave, ~50% duty cycle |
| Connector | 3-pin header — GND / VCC / CLK_OUT |
| Main IC | NE555P (DIP-8) |
| PCB | 2-layer, 4× M3 mounting holes |
Repo Structure
Documentation/
├── datasheet.pdf ← Full datasheet with specs, BOM, pinout, and theory
└── schematic.pdf ← Exported schematic
Hardware/
├── 555-timer-clock.kicad_sch
├── 555-timer-clock.kicad_pcb
└── 555-timer-clock.kicad_pro
Production/
├── Gerbers/ ← Ready to send to a PCB fab
└── ZIP/
└── 555-timer-clock-rA.zip ← Zipped Gerbers, ready to uploadOrdering a PCB
Upload Production/ZIP/555-timer-clock-rA.zip to any PCB fab:
Recommended: 2 layers · FR-4 · 1.6 mm · HASL
Documentation
See Documentation/datasheet.pdf for the full datasheet. includes BOM, pinout, how to use it, how to change the speed, and safety notes.
Mohammad Aljumaah · mohammad-aljumaah.me
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 10Kohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 10uF.25V | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C1 |
| 1 | 1Kohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
The 5 most common of 9 parts.
Similar boards
- 2 layers370.8 × 298.5 mm
8 Bit Computer
The-Invent0r/8-bit-Computer-PCB
These are the KiCAD files for my 8-Bit Computer.
323 parts142 - 2 layers200 × 96 mm
Touchtone555
DarcyJProjects/touchtone555
An open-source DIY, NE555-based analogue synthesizer - play notes with a stylus
73 parts33 - 4 layers340 × 210 mm
- 2 layers152.9 × 74.9 mm
- 2 layers88.9 × 50.8 mm
SynthCard
benjiaomodular/SynthCard
I designed this project with the help of PCBWay. You can get a copy of these cards through the PCBWay Shared Projects page.
16 parts19MIT - 4 layers194.5 × 188.6 mm
MyCpu
fortinsylvain/MyCpu
Home brew CPU Hardware with 1-bit ALU implementation using 74LSxx, a micro-code and assembler coded in C#.
162 parts18MIT - 2 layers145.3 × 129.9 mm
C128Diag
hackup/C128Diag
Replica of the Commodore C128 Diagnostic Test cartridge Assy No. 325093-01.
61 parts16
Questions
How big is the 555-timer clock PCB?
It measures 33.5 × 31 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 555-timer clock use?
9 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 555-timer clock KiCad files?
From the mohammad-aljumaah/555-clock-module repository on GitHub, at the commit this page was made from: the board is Hardware/555-timer-clock.kicad_pcb and its schematic Hardware/555-timer-clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 555-timer clock 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).