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2 layers16.5 × 15.5 mm555-timer, the printed circuit board in 3D

555-timer

smkent/pcb

PCB designs

Size
16.5 × 15.5 mm
Copper layers
2
Thickness
1.6 mm
Parts
17
Nets
11
Pads
36
Tracks, vias
82, 15
Pours
1
Routed
Yes
KiCad
KiCad 8.0 (file 20240108)
Created
22 Mar 2024
Updated
11 Sep 2026

Overview

555-timer is an open-source printed circuit board by smkent, from the smkent/pcb repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 16.5 × 15.5 mm with 17 parts on 11 nets, routed with 82 tracks and 15 vias.

It is built around the NE555. Its parts include 6 resistors, 2 capacitors, 2 diodes, 2 connectors and 1 IC.

Main components

1

README

README.md

PCB designs

A monorepository of my PCB designs created with KiCAD 8.

Layout and Workflow

Custom symbols and footprints are located in libraries, which is shared between PCB projects using ${KIPRJMOD}.

Individual PCB projects (e.g. *.kicad_pro and friends) are located within within pcb for active projects, or pcb-archived for archived projects.

When a PCB is ordered from a project, fabrication outputs are created and in the project's fab subdirectory and committed to the repository.

Setup

Ensure pipx is installed:

sh
pip install pipx

Install scons:

sh
pipx install scons

Install KiCAD-related dependencies using the system site packages directory:

sh
pipx install --system-site-packages kikit interactivehtmlbom

Build

To render all outputs, simply run scons.

To render outputs for a particular board, run scons -u within that board's project subdirectory.

Licenses

Individual hardware designs in this repository may use different licenses. The following licenses apply unless an included design directory specifies different license(s).

The lcsc KiCAD symbols, footprints, and 3D models libraries were created using easyeda2kicad (pypi), which are from LCSC. More info about easyeda2kicad

Parts

17
QtyValueFootprintReferences
30RResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR0, R3, R4
21KResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR5, R6
2LED_Smallcustom:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder_simpleLED1, LED2
10u1discrete:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC0
110KResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR1
11ucustom:C_Combo_CP_Elec_5x5.4C1
1500Kdiscrete:Potentiometer_3.8mmx3.0mm_VerticalRV1
1LOGOgraphics:oshw-logo-2mmG***
1LOGOgraphics:wa-state-heart-3mmG***
1LOGOgraphics:oshw-logo-1.5mmG***
1NE555Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU1
1Pin headerscustom:PinHeader_1x02_P2.54mm_Vertical_simpleJ2
1Pin headerscustom:PinHeader_1x03_P2.54mm_Vertical_simple_pad2gndJ1

Questions

How big is the 555-timer PCB?

It measures 16.5 × 15.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the 555-timer use?

17 parts, built around the NE555. 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 KiCad files?

From the smkent/pcb repository on GitHub, at the commit this page was made from: the board is pcb/jigs/555-timer/555-timer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the 555-timer design in my own project?

Its repository publishes it under the CC-BY-SA-4.0 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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