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

All Pass filter from Jake Rothman, Practical Electronics, June 2026
SwitchBoard is an open-source printed circuit board by Acramonics, from the Acramonics/AllPassFilter repository on GitHub. It is a 2-layer board of 48 × 37.6 mm with 22 parts on 21 nets, routed with 114 tracks and 0 vias.
Its parts include 9 resistors, 6 capacitors, 3 connectors, 1 diode 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 |
|---|---|---|---|
| 6 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R5, R6, R7 |
| 6 | 47uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, C2, C3, C4, C5, C6 |
| 2 | 22k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R8 |
| 2 | Conn_01x04_Pin | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J1, J2 |
| 1 | 10K 0.6W | Resistor_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R9 |
| 1 | Conn_01x03_Pin | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J3 |
| 1 | LED_Dual_Bidirectional | LED_THT:LED_D5.0mm | D1 |
| 1 | SW_4PDT_x4 | ACRM:PushSwitch_4PDT_2x6Pin_P3.18x2.8 | SW1 |
The 20 most common of 22 parts.
It measures 48 × 37.6 mm and has 2 copper layers, 1.6 mm thick.
22 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_SwitchBoard/SwitchBoard.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.

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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