2 layers228.6 × 76.2 mm
Blad
hringdrifi/blad-hy0020
This KiCad export places center-origin Smiðr switch footprints from the physical layout and emits a matching schematic with keyboard matrix nets.
91 partsCERN-OHL-P-2.0
2 layers228.6 × 76.2 mm
Blad
hringdrifi/blad1This KiCad export places center-origin Smiðr switch footprints from the physical layout and emits a matching schematic with keyboard matrix nets.
- Size
- 228.6 × 76.2 mm
- Copper layers
- 2
- Thickness
- 1.2 mm
- Parts
- 117
- Nets
- 84
- Pads
- 615
- Tracks, vias
- 386, 1,854
- Pours
- 529
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 8 Sep 2026
- Updated
- 23 Sep 2026
Overview
Blad is an open-source printed circuit board by hringdrifi, from the hringdrifi/blad repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 228.6 × 76.2 mm with 117 parts on 84 nets, routed with 386 tracks and 1,854 vias.
It is built around the SRV05-4, 1N4148W and 1N5819W, with the AO3401A, CR163223F and MSK12C02-HB2.5 among its other parts. Its parts include 43 diodes, 43 switches, 5 resistors, 2 ICs and 2 connectors.
Main components
6
SRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
1N5819W
SOD-12313A 350mA 40V 5uA@30V 600mV@200mA Standalone SOD-123 Schottky Diodes ROHSJSMSEMISchottky Diodes
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
CR163223F
0603-55℃~+155℃ 100mW 322kΩ Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSMeritekChip Resistor - Surface Mount
MSK12C02-HB2.5
SMD,6.7x1.5mmSlide SwitchesSHOU HAN
README
pcb/README.mdBlað KiCad export
Generated by Smiðr.
This KiCad export places center-origin Smiðr switch footprints from the physical layout and emits a matching schematic with keyboard matrix nets.
- Plate PCB: blad_switch_plate.kicad_pcb contains center-origin key-hole footprints for the same physical layout.
- Switch footprint: Smidr:SW_Smidr_Choc_Hotswap
- Diode footprint: Smidr:D_Smidr_SOD123
- Footprint library: smidr.pretty is included in this ZIP and referenced by fp-lib-table.
- Switch outlines: keycap, fab, and courtyard geometry are generated from each key's w/h.
- RGB Matrix: no per-key RGB LEDs placed.
- Backlight: no per-key backlight LEDs placed.
- Direct-pin projects connect each switch between its direct GPIO net and GND.
- Matrix projects connect switches and diodes using ROWn/COLn nets.
- MS88SF21 symbol:
Smidr:MinewSemi_nRF52840_MS88SF21_5V_USB_Availablefollows the MinewSemi Store product namenRF52840-MS88SF21and its5V / USB Availablevariant; the manufacturer hardware code1Y40AI-Uis retained in theHardware Codeproperty. - MS88SF21 footprint:
Smidr:RF_Module_MinewSemi_MS88SF21uses the manufacturer's 1.8 x 0.8 mm recommended lands and includes the PCB-antenna keepout. - MS88SF21 3D model:
smidr.3dshapes/MS88SF21.stepis generated locally from the manufacturer dimensions byscripts/generate_ms88sf21_step.py. - The MS88SF21 library assets are available for migration, but the existing HY0020 circuit and board placement have not been replaced yet.
- Distributor order codes and module hardware codes are intentionally not used as the primary symbol name; record them as supplier-specific purchasing data when needed.
Parts
117| Qty | Value | Footprint | References |
|---|---|---|---|
| 42 | 1N4148W | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +26 |
| 32 | 1U | Smidr:SW_Smidr_Choc_Hotswap | SW1, SW2, SW10, SW11, SW12, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW25, SW26 +16 |
| 13 | MountingHole | MountingHole:MountingHole_2.1mm | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13 |
| 6 | 1.25U | Smidr:SW_Smidr_Choc_Hotswap | SW13, SW34, SW35, SW37, SW40, SW42 |
| 2 | 1.75U | Smidr:SW_Smidr_Choc_Hotswap | SW23, SW24 |
| 2 | 27 | Resistor_SMD:R_0603_1608Metric | R4, R5 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R3 |
| 2 | BLM21PG121SN1D | Inductor_SMD:L_0805_2012Metric | L1, L2 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 100u | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 1N5819W | Diode_SMD:D_SOD-123 | D43 |
| 1 | 2.25U | Smidr:SW_Smidr_Choc_Hotswap | SW39 |
| 1 | 2.75U | Smidr:SW_Smidr_Choc_Hotswap | SW38 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | CR1632 | Smidr:BatteryHolder_Takachi_BS-S-1632 | BT1 |
| 1 | HRO_TYPE-C-31-M-12 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | LOGO | Smidr:logo | G*** |
| 1 | MS88SF21 1Y40AI-U | Smidr:RF_Module_MinewSemi_MS88SF21 | U2 |
| 1 | MSK12C02-HB2.5 | Button_Switch_SMD:SW_SPDT_Shouhan_MSK12C02 | S1 |
| 1 | PTC 500mA Hold | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | SWD | Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm_Vertical | J2 |
The 115 most common of 117 parts.
Questions
How big is the Blad PCB?
It measures 228.6 × 76.2 mm and has 2 copper layers, 1.2 mm thick.
What parts does the Blad use?
117 parts, built around the SRV05-4, 1N4148W, 1N5819W and AO3401A. 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 Blad KiCad files?
From the hringdrifi/blad repository on GitHub, at the commit this page was made from: the board is pcb/blad.kicad_pcb and its schematic pcb/blad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Blad design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 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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