2 layers117.7 × 153.4 mm Anaphase, the printed circuit board in 3D

Anaphase

anaphase is a Bluetooth/USB split ergonomic keyboard with a 3D printed case and custom PCB base.

Size: 117.7 × 153.4 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 55
Nets: 104
Pads: 344
Tracks, vias: 1,200, 247
Pours: 1
Routed: Yes
KiCad: KiCad 5 (file 20210824)
Created: 1 Nov 2021
Updated: 10 Aug 2026

Overview

Anaphase is an open-source printed circuit board by reversebias, from the reversebias/anaphase repository on GitHub. It is a 2-layer board of 117.7 × 153.4 mm with 55 parts on 104 nets, routed with 1,200 tracks and 247 vias.

Its parts include 16 capacitors, 15 connectors, 10 resistors, 4 ICs and 4 switches.

README

README.md

anaphase wireless split keyboard

anaphase is a Bluetooth/USB split ergonomic keyboard with a 3D printed case and custom PCB base.

Firmware

ZMK config lives in zmk-config/, defining anaphase_left (BLE central) and anaphase_right as full boards (E73-2G4M08S1C nRF52840 modules, not a shield). Pinned to ZMK v0.3.0 (Zephyr 3.5, LVGL 8.3.7). CI builds both halves via the shared ZMK user-config workflow; grab anaphase_left-zmk.uf2 / anaphase_right-zmk.uf2 from the Actions artifacts and drag onto the Adafruit bootloader mass-storage device (double-tap reset).

Rollback (last pre-migration build, 2022-03-05)

Primary: archive/2022 dumps/CURRENT_{left,right}.UF2 — bootloader readbacks of the actual firmware both halves ran for four years, captured 2026-08-09 before the v0.3.0 migration was flashed. Verified: contiguous 0x1000..0xEA000, valid vector tables, includes the NVS storage region (BLE bonds as of capture). To restore: double-tap reset on the affected half, drag the matching file onto the mass-storage volume. The family ID differs from newly-built uf2s (0x239A0029 board-specific vs 0xADA52840 generic) — bootloader 0.6.2 accepts both, verified against its source.

Secondary (reconstruction from source, if the dumps are ever lost):

zmk-config: commit 9e7d2f7
zmkfirmware/zmk: commit f1b5dc408144e7f334bad59da6e9ac788a56e0c7 (main @ 2022-03-05)
which pins zephyr v2.5.0+zmk-fixes (LVGL 7.6.1)
build container: zmkfirmware/zmk-build-arm:2.5 (local Docker build; modern CI images will not build this tree)

Bootloader on both halves: Adafruit nRF52 UF2 bootloader 0.6.2, pca10056 build (archive/2022 dumps/INFO_UF2_*.TXT). App flashing never touches it.

Parts

Qty	Value	Footprint	References
10	4.7uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C1, C2, C3, C4, C5, C6, C9, C10, C11, C12
6	1uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C7, C8, C13, C14, C15, C16
4	5.1k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1, R2, R3, R4
2	10uH	Inductor_SMD:L_0603_1608Metric_Pad1.05x0.95mm_HandSolder	L1, L2
2	2.49k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R5, R6
2	3.9k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R7, R8
2	32.768kHz	Crystal:Crystal_SMD_MicroCrystal_CM9V-T1A-2Pin_1.6x1.0mm	Y1, Y2
2	390k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R9, R10
2	AMBER	LED_SMD:LED_0603_1608Metric	D1, D2
2	Battery pads	Inductor_SMD:L_1210_3225Metric	J15, J16
2	E73-2G4M08S1C-52840	anaphase:E73-2G4M08S1C-52840	U1, U2
2	HRO_TYPE-C-31-M-12	anaphase:USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1, J2
2	JST-SH, R1	Connector_JST:JST_SH_BM07B-SRSS-TB_1x07-1MP_P1.00mm_Vertical	J5, J6
2	JST-SH, R2	Connector_JST:JST_SH_BM07B-SRSS-TB_1x07-1MP_P1.00mm_Vertical	J7, J8
2	JST-SH, R3	Connector_JST:JST_SH_BM07B-SRSS-TB_1x07-1MP_P1.00mm_Vertical	J9, J10
2	JST-SH, R4	Connector_JST:JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical	J11, J12
2	MCP73831-2-OT	Package_TO_SOT_SMD:SOT-23-5	U3, U4
2	PCM12	Button_Switch_SMD:SW_SPDT_PCM12	SW1, SW2
2	SSD1306 OLED	anaphase:Molex_5052782033	J3, J4
2	SW_Push	Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK	SW3, SW4
1	SWD header	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J13

Questions

How big is the Anaphase PCB?

It measures 117.7 × 153.4 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Anaphase use?

55 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 Anaphase KiCad files?

From the reversebias/anaphase repository on GitHub, at the commit this page was made from: the board is hardware/kicad_5.99/anaphase.kicad_pcb and its schematic hardware/kicad_5.99/anaphase.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Anaphase design in my own project?

Its repository states no licence, so its author keeps all rights: ask reversebias before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/reversebias-anaphase" title="Anaphase in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/reversebias-anaphase.jpg" alt="Anaphase" width="1200" height="900">

A picture that opens the board, for a README

[![Anaphase](https://pcbkit.io/embed/boards/reversebias-anaphase.jpg?size=s)](https://pcbkit.io/boards/reversebias-anaphase)

Source

Repository: reversebias/anaphase
Board file: hardware/kicad_5.99/anaphase.kicad_pcb
Commit: 96819d8
Licence: Not stated

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