2 layers112.2 × 143.1 mm Second pcb, the printed circuit board in 3D

Second pcb

Size: 112.2 × 143.1 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 195
Nets: 78
Pads: 3,447
Tracks, vias: 278, 10
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 19 May 2025
Updated: 13 Aug 2025

Overview

Second pcb is an open-source printed circuit board by Tomeee02, from the Tomeee02/PCB repository on GitHub. It is a 2-layer board of 112.2 × 143.1 mm with 195 parts on 78 nets, routed with 278 tracks and 10 vias.

It is built around the CJ432 and MIC29502WU. Its parts include 62 ICs, 56 switches and 55 diodes.

Main components

README

README.md

PCB

Parts

195

Qty	Value	Footprint	References
55	Diode	Diode_SMD:D_PowerDI-123	D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +39
46	Keyswitch	custom_footprints:3rd	S10, S11, S12, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26 +30
22	TestPoint	TestPoint:TestPoint_Pad_D1.5mm	TP1, TP2, TP3, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22 +6
4	Keyswitch	custom_footprints:Triangle	S2, S7, S8, S13
3	Keyswitch	custom_footprints:8mm	S1, S46, S55
2	CJ432	lettersAndNumbers:Shift	U52, U53
2	Keyswitch	custom_footprints:oblong 230	S50, S51
1	CJ432	lettersAndNumbers:Ctrl	U20
1	CJ432	lettersAndNumbers:G	U39
1	CJ432	lettersAndNumbers:N	U46
1	CJ432	lettersAndNumbers:S	U51
1	CJ432	lettersAndNumbers:Enter	U23
1	CJ432	lettersAndNumbers:,	U2
1	CJ432	lettersAndNumbers:A	U15
1	CJ432	lettersAndNumbers:Esc	U24
1	CJ432	lettersAndNumbers:F11	U36
1	CJ432	lettersAndNumbers:9	U14
1	CJ432	lettersAndNumbers:D	U21
1	CJ432	lettersAndNumbers:R	U50
1	CJ432	lettersAndNumbers:.	U4
1	CJ432	lettersAndNumbers:4	U9
1	CJ432	lettersAndNumbers:E	U22
1	CJ432	lettersAndNumbers:M	U45
1	CJ432	lettersAndNumbers:H	U40
1	CJ432	lettersAndNumbers:F1	U26
1	CJ432	lettersAndNumbers:O	U47
1	CJ432	lettersAndNumbers:Tab	U55
1	CJ432	lettersAndNumbers:J	U42
1	CJ432	lettersAndNumbers:T	U54
1	CJ432	lettersAndNumbers:F8	U33
1	CJ432	lettersAndNumbers:F7	U32
1	CJ432	lettersAndNumbers:F4	U29
1	CJ432	lettersAndNumbers:6	U11
1	CJ432	lettersAndNumbers:7	U12
1	CJ432	lettersAndNumbers:-	U3
1	CJ432	lettersAndNumbers:I	U41
1	CJ432	lettersAndNumbers:K	U43
1	CJ432	lettersAndNumbers:F10	U35
1	CJ432	lettersAndNumbers:L	U44
1	CJ432	lettersAndNumbers:F9	U34
1	CJ432	lettersAndNumbers:W	U58
1	CJ432	lettersAndNumbers:F6	U31
1	CJ432	lettersAndNumbers:F3	U28
1	CJ432	lettersAndNumbers:5	U10
1	CJ432	lettersAndNumbers:1	U6
1	CJ432	lettersAndNumbers:FN	U38
1	CJ432	lettersAndNumbers:Backslash	U18
1	CJ432	custom_footprints:LCD	U62
1	CJ432	lettersAndNumbers:X	U59
1	CJ432	lettersAndNumbers:C	U19
1	CJ432	lettersAndNumbers:P	U48
1	CJ432	lettersAndNumbers:F	U25
1	CJ432	lettersAndNumbers:Alt	U16
1	CJ432	lettersAndNumbers:0	U5
1	CJ432	lettersAndNumbers:V	U57
1	CJ432	lettersAndNumbers:B	U17
1	CJ432	lettersAndNumbers:Y	U60
1	CJ432	lettersAndNumbers:F2	U27
1	CJ432	lettersAndNumbers:F12	U37
1	CJ432	lettersAndNumbers:F5	U30
1	CJ432	lettersAndNumbers:8	U13
1	CJ432	lettersAndNumbers:Z	U61
1	CJ432	lettersAndNumbers:Q	U49
1	CJ432	lettersAndNumbers:3	U8
1	CJ432	lettersAndNumbers:U	U56
1	CJ432	lettersAndNumbers:2	U7
1	MIC29502WU	custom_footprints:0,5mm FPC Connector 5 pin	U1
1	SW_Nidec_CAS-120A1	custom_footprints:Joystick	SW1

Questions

How big is the Second pcb PCB?

It measures 112.2 × 143.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Second pcb use?

195 parts, built around the CJ432 and MIC29502WU. 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 Second pcb KiCad files?

From the Tomeee02/PCB repository on GitHub, at the commit this page was made from: the board is second_pcb/second_pcb.kicad_pcb and its schematic 02.12/02.12.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Second pcb design in my own project?

Its repository states no licence, so its author keeps all rights: ask Tomeee02 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/tomeee02-pcb-second-pcb" title="Second pcb 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/tomeee02-pcb-second-pcb.jpg" alt="Second pcb" width="1200" height="900">

A picture that opens the board, for a README

[![Second pcb](https://pcbkit.io/embed/boards/tomeee02-pcb-second-pcb.jpg?size=s)](https://pcbkit.io/boards/tomeee02-pcb-second-pcb)

Source

Repository: Tomeee02/PCB
Board file: second_pcb/second_pcb.kicad_pcb
Commit: aab8ca5
Licence: Not stated

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