2 layers209.7 × 76.4 mm
Hhkb universal
calvin-mcd/universal-vault
pcb for the vault35 covering all sorts of layout options
216 parts20GPL-3.0
2 layers303.7 × 86.6 mm
Arrowhead
calvin-mcd/Arrowhead2unibody split 40s keyboard
- Size
- 303.7 × 86.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 128
- Nets
- 98
- Pads
- 507
- Tracks, vias
- 591, 44
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 20 Apr 2024
- Updated
- 6 May 2025
Overview
Arrowhead is an open-source printed circuit board by calvin-mcd, from the calvin-mcd/Arrowhead repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 303.7 × 86.6 mm with 128 parts on 98 nets, routed with 591 tracks and 44 vias.
It is built around the 74AHCT1G125SE and PRTR5V0U2X. Its parts include 50 diodes, 11 capacitors, 5 switches, 4 ICs and 3 resistors. It belongs with the keyboards and input boards and the RP2040 and STM32 boards of this library.
Main components
2
74AHCT1G125SE
SOT-353-40℃~+125℃ 1 1 4.5V~5.5V 4.7ns@5V,50pF 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOT-353 Buffers, Drivers, Receivers, Transceivers ROHSDiodes IncorporatedBuffers, Drivers, Receivers, Transceivers
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
README
README.mdArrowhead
Arrowhead is a unibody split 40s keyboard conveiced by elkinoflop and designed by Calvin0563 which supports 1 center rotary encoder and 1 bottom row roller encoder, as well as 2 indicator leds.
Layout
Pictures
Todo
- order & test pcb
- design case
- create firmware
Disclaimer
Please note that this project is a work in progress with no guarantees of a working outcome. No-one involved in this project is responsible for any usage issues that may arise. However, feel free to edit, modify and otherwise utilise these files.
License
This project is released under the GPL v3 License. Please refer to the LICENCE file.
Credits
As always big thanks to the many people who helped me and inspired this board!
Any questions, contact Calvin0563 on Discord.
Parts
128| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | D_Small | Diode_SMD:D_SOD-123F | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +32 |
| 41 | MX_SW_solder | PCM_marbastlib-mx:SW_MX_1u | MX2, MX10, MX11, MX14, MX15, MX16, MX17, MX18, MX19, MX20, MX21, MX22, MX23, MX25, MX26, MX27 +25 |
| 8 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C5, C6, C8, C11 |
| 4 | MX_SW_solder | PCM_marbastlib-mx:SW_MX_1.5u | MX1, MX24, MX37, MX39 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C9, C10 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | MX_SW_solder | PCM_marbastlib-mx:SW_MX_1.75u | MX12, MX13 |
| 2 | MX_stab | PCM_marbastlib-mx:STAB_MX_P_2.25u | S2, S3 |
| 2 | YS-SK6812MINI-E | kbd:YS-SK6812MINI-E | LED1, LED2 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 500mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 74AHCT1G125 | Package_TO_SOT_SMD:TSOT-23-5 | U4 |
| 1 | EVQWGD001 | swoop:RollerEncoder | EN1 |
| 1 | JST SH | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J3 |
| 1 | MX_SW_solder | PCM_marbastlib-mx:SW_MX_1.25u | MX43 |
| 1 | MX_stab | PCM_marbastlib-mx:STAB_MX_P_2.75u | S1 |
| 1 | PRTR5V0U2X | Package_TO_SOT_SMD:SOT-143 | U2 |
| 1 | Pico EZmate | Connector_Molex:Molex_Pico-EZmate_78171-0004_1x04-1MP_P1.20mm_Vertical | J4 |
| 1 | RotaryEncoder_Switch | PCM_marbastlib-various:ROT_Alps_EC11E-Switch | SW1 |
| 1 | STM32F072CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | XC6206PxxxMR-Regulator_Linear | Package_TO_SOT_SMD:SOT-23 | U3 |
Questions
How big is the Arrowhead PCB?
It measures 303.7 × 86.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Arrowhead use?
128 parts, built around the 74AHCT1G125SE and PRTR5V0U2X. 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 Arrowhead KiCad files?
From the calvin-mcd/Arrowhead repository on GitHub, at the commit this page was made from: the board is Project/Arrowhead.kicad_pcb and its schematic Project/Arrowhead.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Arrowhead 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).
Similar boards
- 2 layers242.9 × 95.3 mm
- 2 layers99.6 × 43.3 mm
- 4 layers242.9 × 95.3 mm
The nicholas van prototype
calvin-mcd/the-nicholas-van
EC (topre) PCB for trashman's vanagon
141 parts2 - 2 layers76.2 × 119.1 mm
- 2 layers304.8 × 119.1 mm
- 2 layers284.7 × 94.2 mm
- 4 layers241.2 × 327.2 mm
