
AllPassFilter
Acramonics/AllPassFilter
All Pass filter from Jake Rothman, Practical Electronics, June 2026

All Pass filter from Jake Rothman, Practical Electronics, June 2026
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.
This uses the SamacSys footprint for the Alpha switch available via the Mouser web site and directly from Component Search Engine
First create a path name for the SamacSys Library:
In the main KiCad window, select Preferences>Configure Paths
Click the + sign and add a path called KICAD_SAMACSYS_LIBS and pointing to wherever the directory is containing the SamacSys_Parts.lib file.
Click OK
Next, configure the symbol library:
Preferences>Manage Symbol Libraries+ sign and add a new library:Nickname = SamacSysLibrary Path = ${KICAD_SAMACSYS_LIBS}/SamacSys_Parts.kicad_symDescription = SamacSys Symbolsand click OK.
Finally, configure the footprints library:
Preferences>Manage Footprint Libraries+ sign and add a new library:Nickname = SamacSysLibrary Path = ${KICAD_SAMACSYS_LIBS}/SamacSys_Parts.prettyDescription = SamacSys Footprintsand click OK.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | Conn_01x08_Pin | Connector_Molex:Molex_KK-254_AE-6410-08A_1x08_P2.54mm_Vertical | J2 |
| 1 | Conn_01x10_Pin | Connector_Molex:Molex_KK-254_AE-6410-10A_1x10_P2.54mm_Vertical | J1 |
| 1 | PTD904-2015Kc104 | SamacSys:PTD9042015Kc104 | VR1 |
| 1 | SR2612F-0112-21R0B-D8-N | SamacSys:SR2612F011221R0BD8N | S1 |

Acramonics/AllPassFilter
All Pass filter from Jake Rothman, Practical Electronics, June 2026

Acramonics/AllPassFilter
All Pass filter from Jake Rothman, Practical Electronics, June 2026

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It measures 54.9 × 39 mm and has 2 copper layers, 1.6 mm thick.
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.
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.
Its repository states no licence, so its author keeps all rights: ask Acramonics before reusing the design.