2 layers37 × 19 mm
Passive rpi hub75-adapter
hzeller/rpi-rgb-led-matrix
Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
2 parts4.4kGPL-2.0
2 layers15 × 27.9 mm
Fms link
levicole/fms-linkA GB Link to 3.5mm adapter for syncing FMS with other devices (including Nanoloop)
- Size
- 15 × 27.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 2
- Nets
- 3
- Pads
- 10
- Tracks, vias
- 18, 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20241229)
- Created
- 19 Sep 2026
- Updated
- 26 Sep 2026
Overview
Fms link is an open-source printed circuit board by levicole, from the levicole/fms-link repository on GitHub, published under the CC-BY-4.0 licence. It is a 2-layer board of 15 × 27.9 mm with 2 parts on 3 nets, routed with 18 tracks and 1 via.
README
Readme.mdFMS Link
A small PCB that plugs into a Game Boy link cable and breaks the sync lines out to a 3.5mm TRS jack, for clocking FMS and nanoloop against other gear — Pocket Operators, Volcas, eurorack, anything that takes an analog clock.
The previews are rendered bare, without the jack's 3D model, so the copper and silkscreen stay visible.
Wiring
| TRS | Game Boy link | Purpose |
|---|---|---|
| Tip | SC (pin 5) | Serial clock |
| Ring | SD (pin 4) | — |
| Sleeve | GND (pin 6) | Ground |
This matches the analog clock cable wiring in the FMS guide.
VDD, SO and SI are not connected. The jack's shunt terminal (pin 4) is the tip's
normalling contact — internally shorted to the tip when nothing is plugged in, and
released when a plug is inserted. It is left unconnected.
Bill of materials
| Ref | Part | Notes |
|---|---|---|
| J1 | WQP-WQP729JH-B | 3.5mm right-angle switched stereo jack |
Order the blue
-Bpart, not the red-R. Per the manufacturer datasheet, the-Ris mono and has no ring contact, so it cannot carrySD. Thonk sells both on their 729JH page.
The board is 15.0 × 27.9 mm including the link-port tongue, two layers, no other parts. The jack's threaded barrel protrudes 4.3 mm past the top edge.
Ordering from OSH Park
make zip writes fms-link-gerbers.zip — flat, no enclosing folder, with the .gbrjob
manifest left out. Upload it at oshpark.com.
The board is 0.649 sq in, so OSH Park's 2-layer service runs about $3.25 for three copies plus shipping. Check their rendered preview before checkout — in particular that the four jack slots come through as slots rather than round holes.
Credits
The Game Boy link-port edge-connector footprint (gb-link-socket) and the board tongue
geometry come from Nick Palmer's
gb-link-cable breakout board — the pad
positions and tongue outline are Nick Palmer's, reformatted here for KiCad 10. Nick Palmer's
design is licensed under CC BY 4.0. That
project in turn followed
this devlog
on building a link cable breakout, and Nick Palmer wrote up the build
on palmr.co.uk.
Everything else here — the TRS jack footprint and 3D model, the schematic, the board outline and routing — is new.
License
FMS Link is © 2026 Levi Kennedy and licensed under
CC BY 4.0; see LICENSE. You
may copy, modify, build and sell it, provided you credit FMS Link and link back to this
repository. The gb-link-socket footprint and tongue geometry remain Nick Palmer's work
under the same license, and reuse of them should credit Nick Palmer as described above.
Parts
2| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | WQP-WQP729JH-B | Jack_3.5mm_QingPu_WQP-WQP729JH_Horizontal | J1 |
| 1 | gb-link-socket | gb-link-socket | GB1 |
Questions
How big is the Fms link PCB?
It measures 15 × 27.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Fms link use?
2 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 Fms link KiCad files?
From the levicole/fms-link repository on GitHub, at the commit this page was made from: the board is fms-link.kicad_pcb and its schematic fms-link.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Fms link design in my own project?
Its repository publishes it under the CC-BY-4.0 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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