2 layers178.6 × 94.7 mm
2 layers135.7 × 91.1 mm
Spectrogram left
jakekyee/keybaordkeyboardthing
- Size
- 135.7 × 91.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 80
- Nets
- 51
- Pads
- 546
- Tracks, vias
- 518, 191
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Mar 2026
- Updated
- 20 Jul 2026
Overview
Spectrogram left is an open-source printed circuit board by jakekyee, from the jakekyee/keybaord repository on GitHub. It is a 2-layer board of 135.7 × 91.1 mm with 80 parts on 51 nets, routed with 518 tracks and 191 vias.
It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.mdKeyboard
Quick Summary
A split inspired by the Quefrency.
Build Guide
- Placeholder
BOM
- Placeholder
Firmware
https://github.com/jakekyee/zmk-config-stuff
Techincal Notes
The wiring on the right side is kinda crazy because I didn't really know what I was doing in KiCad. Here's the reference I used when writing the firmware.
Parts
80| Qty | Value | Footprint | References |
|---|---|---|---|
| 30 | D | Diode_SMD:D_SOD-123 | D_A1, D_A2, D_A3, D_A4, D_A5, D_A6, D_A7, D_B1, D_B2, D_B3, D_B4, D_B5, D_B6, D_C1, D_C2, D_C3 +14 |
| 23 | SW_Push | jakestuff:ChocMX_flippedpads | SW_A1, SW_A2, SW_A3, SW_A4, SW_A5, SW_A6, SW_A7, SW_B2, SW_B3, SW_B4, SW_B5, SW_B6, SW_C2, SW_C3, SW_C4, SW_C5 +7 |
| 6 | , , , , , | ||
| 6 | Hole | Mounting_Holes:MountingHole_3.2mm_M3_ISO14580_Pad | H1, H2, H3, H4, H5, H6 |
| 4 | SW_Push | jakestuff:ChocMX | SW_E1, SW_E2, SW_E3, SW_E7 |
| 3 | SW_Push | jakestuff:ChocMX_sameside_flippedpads | SW_B1, SW_C1, SW_CB1 |
| 1 | ProMicro | Keebio-Parts:ArduinoProMicro-ZigZag | U2 |
| 1 | SW_Push | jakestuff:ChocMX_2.25U_reversedstab | SW_D1 |
| 1 | SW_Push | jakestuff:ChocMX_flippedpads_2.25U | SW_EB7 |
| 1 | SW_Push | jakestuff:ChocMX_flippedpads_2.25U_reversedstab | SW_E5 |
The 76 most common of 80 parts.
Questions
How big is the Spectrogram left PCB?
It measures 135.7 × 91.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Spectrogram left use?
80 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 Spectrogram left KiCad files?
From the jakekyee/keybaord repository on GitHub, at the commit this page was made from: the board is working/spectrogram-left/spectrogram-left.kicad_pcb and its schematic working/platestuff/platestuff.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Spectrogram left design in my own project?
Its repository states no licence, so its author keeps all rights: ask jakekyee before reusing the design.
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