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2 layers54.9 × 39 mmSubBoards, the printed circuit board in 3D

All Pass filter from Jake Rothman, Practical Electronics, June 2026

Size
54.9 × 39 mm
Copper layers
2
Thickness
1.6 mm
Parts
4
Nets
22
Pads
43
Tracks, vias
74, 0
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
18 May 2026
Updated
29 Jun 2026

Overview

SubBoards is an open-source printed circuit board by Acramonics, from the Acramonics/AllPassFilter repository on GitHub. It is a 2-layer board of 54.9 × 39 mm with 4 parts on 22 nets, routed with 74 tracks and 0 vias.

Its parts include 2 connectors and 1 switch.

README

kicad_SubBoards/README.md

This uses the SamacSys footprint for the Alpha switch available via the Mouser web site and directly from Component Search Engine

Using the Library

First create a path name for the SamacSys Library:

  1. In the main KiCad window, select Preferences>Configure Paths

  2. Click the + sign and add a path called KICAD_SAMACSYS_LIBS and pointing to wherever the directory is containing the SamacSys_Parts.lib file.

  3. Click OK

Next, configure the symbol library:

  1. In the main KiCad window, select Preferences>Manage Symbol Libraries
  2. Click the + sign and add a new library:
  • Nickname = SamacSys
  • Library Path = ${KICAD_SAMACSYS_LIBS}/SamacSys_Parts.kicad_sym
  • Description = SamacSys Symbols

and click OK.

Finally, configure the footprints library:

  1. In the main KiCad window, select Preferences>Manage Footprint Libraries
  2. Click the + sign and add a new library:
  • Nickname = SamacSys
  • Library Path = ${KICAD_SAMACSYS_LIBS}/SamacSys_Parts.pretty
  • Description = SamacSys Footprints

and click OK.

Parts

4
QtyValueFootprintReferences
1Conn_01x08_PinConnector_Molex:Molex_KK-254_AE-6410-08A_1x08_P2.54mm_VerticalJ2
1Conn_01x10_PinConnector_Molex:Molex_KK-254_AE-6410-10A_1x10_P2.54mm_VerticalJ1
1PTD904-2015Kc104SamacSys:PTD9042015Kc104VR1
1SR2612F-0112-21R0B-D8-NSamacSys:SR2612F011221R0BD8NS1

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Questions

How big is the SubBoards PCB?

It measures 54.9 × 39 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SubBoards use?

4 parts. 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 SubBoards KiCad files?

From the Acramonics/AllPassFilter repository on GitHub, at the commit this page was made from: the board is kicad_SubBoards/SubBoards.kicad_pcb and its schematic kicad/AllPassFilter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the SubBoards design in my own project?

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