Daughterboard
evyd13·gh80-series·GH80-3700/daughterboard/daughterboard.kicad_pcb
About the Daughterboard PCB
Daughterboard is an open source PCB design by evyd13, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 40.6 × 73.3 mm, with 7 components from 6 distinct parts.
By type, the board carries 2 resistors, 1 connector, 1 fuse, 1 relay, 1 speaker and 1 capacitor.
From the project
GH80-1800, GH80-3700 and GH80-3003 by Evy (aka anykeys.eu)
It's a little expansion board to be able to use a speaker or PS/2 mouse, or just to fill up that hole in the case.
You'll also need a JST SH 5 pin cable for this one. Those can be found on aliexpress or similar sites.

Daughterboard bill of materials (BOM)
7 components, 6 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | EXP | JST_SH_SM05B-SRSS-TB_1x05-1MP_P1.00mm_Horizontal | J1 |
| 1 | C183290 Polyfuse | R_0805 | F1 |
| 1 | PS2_FEMALE | ps2_connector | K1 |
| 1 | Speaker | speaker_AST1109MLTRQ | LS1 |
| 1 | 0.1U 4.7u | C_0805 | C1 |
| 2 | 4.7k | R_0805 | R1, R2 |
Daughterboard design files
The KiCad project lives in the evyd13/gh80-series repository on GitHub; these links point at the commit this page was built from.
Daughterboard: common questions
How big is the Daughterboard PCB?
The Daughterboard measures 40.6 × 73.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Daughterboard?
7 components, from 6 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Daughterboard design files?
From the evyd13/gh80-series repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Daughterboard design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which evyd13 chose for the repository.