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

All Pass filter from Jake Rothman, Practical Electronics, June 2026
AllPassFilter is an open-source printed circuit board by Acramonics, from the Acramonics/AllPassFilter repository on GitHub. It is a 2-layer board of 180.4 × 80.9 mm with 102 parts on 50 nets, routed with 484 tracks and 4 vias.
It is built around the NE5532. Its parts include 41 resistors, 34 capacitors, 6 connectors and 5 ICs.
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 |
|---|---|---|---|
| 24 | 1k2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R13, R14, R16, R17, R18, R20, R21, R22, R24, R25, R26, R27, R28, R29, R30 +8 |
| 10 | TestPoint | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10 |
| 8 | 100nF PP | Capacitor_THT:C_Rect_L7.2mm_W5.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C6, C9, C12, C15, C18, C21, C24, C27 |
| 8 | 100pF C0G | Capacitor_THT:C_Disc_D5.1mm_W3.2mm_P5.00mm | C7, C10, C13, C16, C19, C22, C25, C28 |
| 8 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3, R4, R5, R7, R8, R9, R10 |
| 5 | 100nF X7R | Capacitor_THT:C_Rect_L7.2mm_W5.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C17, C20, C23, C26, C29 |
| 5 | NE5532 | Package_DIP:DIP-8_W7.62mm | U1, U2, U3, U4, U5 |
| 4 | 10uF 25V Audio | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C5, C8, C11, C14 |
| 4 | 47pF C0G | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C2, C4, C33, C34 |
| 4 | Inf | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R15, R19, R23 |
| 2 | 100uF 25V GP | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C30, C31 |
| 2 | 10uF 25V NP | Capacitor_THT:C_Radial_D4.0mm_H7.0mm_P1.50mm | C1, C3 |
| 2 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R6 |
| 2 | Conn_01x03_Pin | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J2, J9 |
| 1 | 100R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R39 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R40 |
| 1 | 100uF 25V Audio | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C32 |
| 1 | 22k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R41 |
| 1 | Conn_01x02_Pin | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J7 |
| 1 | Conn_01x05_Pin | Connector_Molex:Molex_KK-254_AE-6410-05A_1x05_P2.54mm_Vertical | J5 |
| 1 | Conn_01x08_Pin | Connector_Molex:Molex_KK-254_AE-6410-08A_1x08_P2.54mm_Vertical | J8 |
| 1 | Conn_01x10_Pin | Connector_Molex:Molex_KK-254_AE-6410-10A_1x10_P2.54mm_Vertical | J6 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | TestPoint_2Pole | TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill0.7mm | TP11 |
The 98 most common of 102 parts.
It measures 180.4 × 80.9 mm and has 2 copper layers, 1.6 mm thick.
102 parts, built around the NE5532. 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/AllPassFilter.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

karawin/Ka-Radio
A wifi webradio with only low cost boards ESP8266 and VS1053 by Jp Cocatrix


QuinnFreedman/modular
A collection of free & open source DIY synthesizer module designs for Eurorack

EleonoreMizo/pedalevite
Pédale Vite — DIY multi-FX pedalboard for guitar/bass/etc.



AidanHockey5/MegaBlaster2
The latest iteration of my hardware Sega Genesis/Megadrive Video Game Music Player
