2 layers140.5 × 30 mm
Type e
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
16 parts3kApache-2.0
2 layers20 × 108.5 mm
Quad passive switch
nickmarrone/OscenOpenSourceOpen source eurorack modules from Oscen Eurorack Instruments
- Size
- 20 × 108.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 13
- Pads
- 48
- Tracks, vias
- 44, 8
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jun 2026
- Updated
- 9 Jun 2026
Overview
Quad passive switch is an open-source printed circuit board by nickmarrone, from the nickmarrone/OscenOpenSource repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 20 × 108.5 mm with 16 parts on 13 nets, routed with 44 tracks and 8 vias.
Its parts include 12 connectors and 4 switches. It belongs with the audio and music boards of this library.
README
QuadPassiveSwitch/README.mdQuad Passive Switch
A 4HP, 3U Eurorack utility module with four independent SPDT (single-pole, double-throw) passive switches. Each section manually routes one signal between two destinations using a sub-mini toggle switch. The whole module is passive — it needs no power and adds no buffering or coloration to the signal.
Specifications
| Format | Eurorack, 3U |
| Width | 4HP (20 mm) |
| Panel height | 128.5 mm |
| Depth | Shallow (passive, no power header) |
| Power | None required |
| Switches | 4 × SPDT sub-mini toggle |
| Jacks | 12 × 3.5 mm mono switched |
How it works
The module is divided into four identical sections, arranged top-left (TL), top-right (TR), bottom-left (BL), and bottom-right (BR). Each section has:
- IN — signal input
- OUT 1 — output selected when the toggle is in position 1
- OUT 2 — output selected when the toggle is in position 2
The toggle switch connects IN to either OUT 1 or OUT 2. Because the path is just a mechanical contact, it works with any signal: audio, CV, gates, clocks, or triggers.
Reverse use (2-to-1)
Since the switch is passive and symmetrical, each section can be used in reverse: patch two sources into OUT 1 and OUT 2, and the toggle selects which one appears at IN. In this mode IN becomes the output and the OUTs become inputs.
Note: as with any passive multiple/switch, only patch a signal into one side of a given section at a time when using it in reverse, to avoid summing or back-feeding sources.
Bill of materials
| Designators | Qty | Part | Footprint |
|---|---|---|---|
| J1–J12 | 12 | 3.5 mm mono switched jack (PJ398SM) | EighthInch_PJ398SM |
| SW1–SW4 | 4 | SPDT sub-mini toggle | Switch_Toggle_SPDT_SubMini |
See production/quad_passive_switch_gerbers_v1.0_bom.csv
for the fabrication BOM.
Files
quad_passive_switch.kicad_sch— schematicquad_passive_switch.kicad_pcb— main PCB layoutquad_passive_switch_faceplate.kicad_pcb— panel / faceplate layoutquad_passive_switch.pdf— rendered schematicquad_passive_switch.kicad_pro— KiCad projectproduction/— Gerbers (*_gerbers_v1.0.zip,*_faceplate_gerbers_v1.0.zip), drill/netlist, BOM, designators, and pick-and-place position files for v1.0
Building it
- Open
quad_passive_switch.kicad_proin KiCad 8.0+ to inspect or modify the design. - To fabricate, send
production/quad_passive_switch_gerbers_v1.0.zip(PCB) andproduction/quad_passive_switch_faceplate_gerbers_v1.0.zip(panel) to a PCB manufacturer. - Solder the 12 jacks and 4 toggle switches per the BOM. There are no other components — no resistors, ICs, or power connector.
Revision
- v1.0 — initial release.
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 3.5mm_Mono_Switched_SymSmall_0.05 | 4ms_Jack:EighthInch_PJ398SM | J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, J12 |
| 4 | SW_SPDT_MSM | 4ms_Switch:Switch_Toggle_SPDT_SubMini | SW1, SW2, SW3, SW4 |
Questions
How big is the Quad passive switch PCB?
It measures 20 × 108.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Quad passive switch use?
16 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 Quad passive switch KiCad files?
From the nickmarrone/OscenOpenSource repository on GitHub, at the commit this page was made from: the board is QuadPassiveSwitch/quad_passive_switch.kicad_pcb and its schematic QuadPassiveSwitch/quad_passive_switch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Quad passive switch design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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