2 layers39.9 × 30 mm 555Timer, the printed circuit board in 3D

555Timer

Size: 39.9 × 30 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 14
Nets: 8
Pads: 33
Tracks, vias: 64, 0
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 15 Jan 2025
Updated: 21 May 2025

Overview

555Timer is an open-source printed circuit board by nandanpi, from the nandanpi/PCB-Design repository on GitHub. It is a 2-layer board of 39.9 × 30 mm with 14 parts on 8 nets, routed with 64 tracks and 0 vias.

It is built around the BS170. Its parts include 4 resistors, 2 capacitors, 1 IC, 1 diode and 1 connector.

Main components

BS170
TO-92-55℃~+150℃ 1 N-channel 1.2Ω@10V 17pF 2.1V 24pF 500mA 60V 7pF 830mW N-Channel TO-92 MOSFETs ROHSonsemiMOSFETs

Parts

Qty	Value	Footprint	References
1	0.1 µF	Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm	C1
1	1 kΩ	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R2
1	100 kΩ	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R3
1	100 µF	Capacitor_THT:CP_Radial_Tantal_D5.0mm_P2.50mm	C2
1	10kΩ	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R4
1	220	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R1
1	BS170	Package_TO_SOT_THT:TO-92_Inline	MOSFET1
1	Conn_01x04_Pin	Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical	J1
1	LED	LED_THT:LED_D3.0mm	D1
1	LM555xN	Package_DIP:DIP-8_W7.62mm	U1

The 10 most common of 14 parts.

Questions

How big is the 555Timer PCB?

It measures 39.9 × 30 mm and has 2 copper layers, 1.6 mm thick.

What parts does the 555Timer use?

14 parts, built around the BS170. 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 555Timer KiCad files?

From the nandanpi/PCB-Design repository on GitHub, at the commit this page was made from: the board is Projects/555Timer/555Timer.kicad_pcb and its schematic Projects/555Timer/555Timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the 555Timer design in my own project?

Its repository states no licence, so its author keeps all rights: ask nandanpi before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/nandanpi-pcb-design-555timer" title="555Timer in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/nandanpi-pcb-design-555timer.jpg" alt="555Timer" width="1200" height="900">

A picture that opens the board, for a README

[![555Timer](https://pcbkit.io/embed/boards/nandanpi-pcb-design-555timer.jpg?size=s)](https://pcbkit.io/boards/nandanpi-pcb-design-555timer)

Source

Repository: nandanpi/PCB-Design
Board file: Projects/555Timer/555Timer.kicad_pcb
Commit: 76dc2bc
Licence: Not stated

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