2 layers133 × 114.7 mm
2 layers226 × 94.2 mm
Calcite60
siderakb/calcite1260/52 keys Kailh Choc V1 low profile switches ortho keyboard
- Size
- 226 × 94.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 196
- Nets
- 131
- Pads
- 758
- Tracks, vias
- 858, 124
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Feb 2023
- Updated
- 7 Nov 2025
Overview
Calcite60 is an open-source printed circuit board by siderakb, from the siderakb/calcite repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 226 × 94.2 mm with 196 parts on 131 nets, routed with 858 tracks and 124 vias.
It is built around the E73-2G4M08S1C, RT9013-33GB and SRV05-4, with the TP4054 and AO3407 among its other parts. Its parts include 61 diodes, 10 resistors, 7 capacitors, 7 connectors and 4 ICs. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
5
E73-2G4M08S1C
SMD,18x13mm-103dBm、-95dBm -40℃~+85℃ 120m 17.05mA 3.3V 8.27mA 8dBm Bluetooth 5.0、Bluetooth 4.2 PWM、SPI、ADC、USB、I2C、ISP、JTAG、DMA nRF52840 Chip SMD,18x13mm Bluetooth Modules ROHSChengdu Ebyte Elec TechBluetooth Modules
RT9013-33GB
SOT-23-5-40℃~+125℃@(Tj) 1 25uA 3.3V 30uVrms 400mV@(500mA) 5.5V 500mA 50dB@(10kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSRICHTEKVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
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)TP4054
SOT-23-5L-40℃~+85℃ 1 25uA 4.2V 4.2V~6.5V 500mA Charging IC Lithium Battery Not supported 恒流充电、恒压充电、涓流充电、自动再充电、充电终止、可编程充电电流、软启动、欠压锁定 SOT-23-5L Battery Management ROHSUMWBattery Management
AO3407
SOT-23-55℃~+150℃ 1 P-Channel 1.4W 1V 260pF 30V 37pF 4.1A 75mΩ@4.5V P-Channel ±20V SOT-23 MOSFETs ROHSBORNMOSFETs
README
README.mdCalcite
Kailh Choc V1 (aka PG1350) low profile switches ortho keyboard, includes PCB and CNC/3DP case, inspired by ARTSEY, Home row mods and Preonic/Planck keyboard.
The keycap in the above picture is from Keychron K1 v2.
Note
Gerber, BOM and CPL files are generated by KiCad JLCPCB Tools plugin.
I use KiCAD KLE Placer plugin to automatically place switch footprints.
If key-switches.pretty folder is empty, use git submodule update --init to clone submodule.
Disclaimer
These files are provided without warranty of any kind.
It is recommended to check yourself before manufacturing and use.
For the full statement, plase see LICENSE.
Parts
196| Qty | Value | Footprint | References |
|---|---|---|---|
| 66 | SW_Push_45deg | key-switches:SW_Kailh_Choc_V1_THT_nSilk | KEY1, KEY2, KEY10, KEY11, KEY12, KEY13, KEY14, KEY15, KEY16, KEY17, KEY18, KEY19, KEY20, KEY21, KEY22, KEY23 +50 |
| 60 | 1N4148 | Diode_SMD:D_SOD-123 | D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24 +44 |
| 11 | MountingHole | calcite:MountingWuerth_M2 | H1, H2, H4, H6, H8, H10, H12, H14, H15, H16, H17 |
| 9 | MountingHole | calcite:mouse_bite | H5, H18, H19, H20, H21, H22, H23, H24, H25 |
| 7 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7 |
| 4 | MountingHole | calcite:MountingHale_M2 | H7, H9, H11, H13 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R3, R6, R8 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3 |
| 3 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2, R4 |
| 3 | Blue | LED_SMD:LED_0603_1608Metric | LD1, LD2, LD3 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C6, C7 |
| 2 | 12pF | Capacitor_SMD:C_0603_1608Metric | C4, C5 |
| 2 | Conn_01x02 | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J3, J5 |
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J4 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 1N5819 | Diode_SMD:D_SOD-323_HandSoldering | D1 |
| 1 | 2M | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 500mA, 6V | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | 820k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | AO3407 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6 |
| 1 | Conn_02x05_Counter_Clockwise | calcite:10pin SWD | J7 |
| 1 | E73-2G4M08S1C | calcite:E73-2G4M08S1C-52840 | U4 |
| 1 | LOGO | LOGO | G*** |
| 1 | RESET | Button_Switch_SMD:SW_SPST_B3U-1000P | SW2 |
| 1 | RT9013-33GB | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | SW_DPDT_x2 | calcite:9_3.5_3.5 Switch | SW1 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | SB1 |
| 1 | TP4054 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
Questions
How big is the Calcite60 PCB?
It measures 226 × 94.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Calcite60 use?
196 parts, built around the E73-2G4M08S1C, RT9013-33GB, SRV05-4 and TP4054. 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 Calcite60 KiCad files?
From the siderakb/calcite repository on GitHub, at the commit this page was made from: the board is Calcite60/pcb/Calcite60.kicad_pcb and its schematic Calcite52/pcb/Calcite52.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Calcite60 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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