2 layers94.9 × 76 mm
ToadsTempest
tikinson/ToadsTempest
Super small custom 42-keys column-staggered ergonomic mechanical keyboard powered by CH552T microcontroller, created for pocket keyboard design contest #00
113 parts11CC0-1.0
2 layers143.6 × 139.6 mm
Kazhan oldCopy
tikinson/kazhancustom 28-keys ergonomic mechanical keyboard powered by CH552T microcontroller
- Size
- 143.6 × 139.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 98
- Nets
- 105
- Pads
- 657
- Tracks, vias
- 230, 40
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 23 Nov 2024
- Updated
- 16 Oct 2026
Overview
Kazhan oldCopy is an open-source printed circuit board by tikinson, from the tikinson/kazhan repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 143.6 × 139.6 mm with 98 parts on 105 nets, routed with 230 tracks and 40 vias.
It is built around the CH552T, USBLC6-2SC6 and PMEG2010EA. Its parts include 34 switches, 19 diodes, 6 resistors, 5 ICs and 3 connectors. It belongs with the 8051 (CH55x, STC, AT89) boards of this library.
Main components
3
CH552T
TSSOP-20-40℃~+85℃ 12Mbps 3.3V~5V USB 2.0 USB to UART、USB to SPI TSSOP-20 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
PMEG2010EA
SOD-3231 Independent 1A 20V 50uA@15V 550mV@1A 5A SOD-323 Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.md🦇Kazhan🦇
WIP. Current PCB is still need a rewiev!
28 Keys. MX and Choc compatible keyboard with CH552T controller. This is the next logical step after my experimental keyboard ToadsTempest.
Idea
Kazhan (Кажан) is derived from the Ukrainian word meaning "bat". As a fan of ZilpZalp/Hummingbird projects i decided make something with same layout but more personalized. Same but different.
What this project is and what it is not
Goals:
- A pet project of a keyboard as an act of absolute self-expression.
- Flexibility and experiments over (and maybe in some case against) minimalistic design approach.
- Testing interesting "non - conventional" switches as extra keys.
- Testing things that i don't saw (yet?) in another keyboard PCB designs.
Non-goals:
- Creation of another variant of the Corne (I like Corne btw, that was my first love in this hobby).
- Design with a definite assembly variant.
- Go through the steps in the keyboard design that I have already tried.
Features
- Mirrored design of PCB to provide split and unibody functionality in one design.
- Alpsalpine limit switches (SW1, SW2 on schematics) as additional switches. I accidentaly understood, that MX keycap kinda fits on them (with 45 dergee rotation), so i would give them a try.
- Wired USB-C (USB 2.0) connection.
- Designed for usage with really affordable chip and F.A.K. firmware.
- Japanese (duplex) matrix of keys and diodes for them: first of all, it's way more easy to solder one dual diode instead of two regular, because you will never put this part with wrond polarity. And also because of type of key matrix, there is two types of dual diodes: with common anode and common cathode.
Layout
BOM
Opening local copy of ibom.html could save some times while soldering.
| Reference | Value | Footprint | Qty | LCSC |
|---|---|---|---|---|
| C1, C2 | 100nF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | 2 | C1525 |
| D1, D4, D5, D8, D9, D11, D13, D15 | BAS70-06-CAnode | Package_TO_SOT_SMD:SOT-23 | 8 | C8651 |
| D2, D3, D6, D7, D10, D12, D14, D16 | BAS70-05-CCatode | Package_TO_SOT_SMD:SOT-23 | 8 | C34489 |
| D17 | PMEG2010EA | Diode_SMD:D_0402_1005Metric_Pad0.77x0.64mm_HandSolder | 1 | C2837790 |
| D18, D19 | PWR LED | LED_SMD:LED_0402_1005Metric | 2 | C130724 |
| F1 | 500mA | Fuse:Fuse_0402_1005Metric_Pad0.77x0.64mm_HandSolder | 1 | C210357 |
| J3 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | 1 | C2765186 |
| R1, R6 | 10k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | 2 | C25744 |
| R2, R3 | 5.1k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | 2 | C25905 |
| R4, R5 | 1k | Resistor_SMD:R_0402_1005Metric | 2 | C11702 |
| SW1, SW2 | ~ | MyFootprintsCollection:SW-TH_SSCF110100 | 2 | C470322 |
| SW4, SW6 | RESET | KEY-SMD_4P-L4.8-W4.8-P3.70-LS6.4-TL | 2 | C2888968 |
| S1–S28 | Keyswitch | SW_Hotswap_Kailh_Choc_MX_1.00u_One_Sided | 28 | |
| U1, U4 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | 2 | C2687116 |
| U2, U3, U5 | CH552T | -- mixed footprints -- | 3 | C111367 |
Note: S1-S28 - is footprints for switches. You can choose between MX or Kailh Choc switches (or both if you like experiments) and solder hotswaps accordingly.
Parts
98| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | Keyswitch | MyFootprintsCollection:SW_Hotswap_Kailh_Choc_MX_1.00u_One_Sided | S1, S2, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 +12 |
| 20 | SolderJumper_2_Open | MyFootprintsCollection:SolderJumper-1.25x0.5 | JP3, JP4, JP5, JP10, JP11, JP12, JP13, JP14, JP15, JP16, JP17, JP18, JP19, JP20, JP21, JP22 +4 |
| 8 | BAS70-05-CCatode | Package_TO_SOT_SMD:SOT-23 | D2, D3, D6, D7, D10, D12, D14, D16 |
| 8 | BAS70-06-CAnode | Package_TO_SOT_SMD:SOT-23 | D1, D4, D5, D8, D9, D11, D13, D15 |
| 5 | Mounting_Hole | MyFootprintsCollection:MountingHole_3.5mmX4.5mm_Pad | H1, H2, H3, H4, H5 |
| 2 | 100nF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C1, C2 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R6 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R2, R3 |
| 2 | BOOT | MyFootprintsCollection:KEY-SMD_4P-L4.8-W4.8-P3.70-LS6.4-TL | SW3, SW5 |
| 2 | CH552T | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U2, U3 |
| 2 | RESET | MyFootprintsCollection:KEY-SMD_4P-L4.8-W4.8-P3.70-LS6.4-TL | SW4, SW6 |
| 2 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1, U4 |
| 2 | ~ | MyFootprintsCollection:SW-TH_SSCF110100 | SW1, SW2 |
| 1 | 500mA | Fuse:Fuse_0402_1005Metric_Pad0.77x0.64mm_HandSolder | F1 |
| 1 | AudioJack4 | MyFootprintsCollection:PJ-320A-REVERSIBLE-B.Cu-placing | J2 |
| 1 | AudioJack4 | MyFootprintsCollection:PJ-320A-REVERSIBLE-F.Cu-placing | J1 |
| 1 | CH552T | MyFootprintsCollection:TSSOP-20_4.4x6.5mm_P0.65mm-REVERSIBLE | U5 |
| 1 | LOGO | MyFootprintsCollection:kazhantest2_1_1_1 | G*** |
| 1 | PMEG2010EA | Diode_SMD:D_0402_1005Metric_Pad0.77x0.64mm_HandSolder | D17 |
| 1 | PWR LED | LED_SMD:LED_0402_1005Metric | D18 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP24 |
| 1 | SolderJumper_2_Open | MyFootprintsCollection:SolderJumper-F.Cu-B.Cu | JP23 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J3 |
| 1 | USR LED | LED_SMD:LED_0402_1005Metric | D19 |
Similar boards
- 2 layers282.6 × 90.8 mm
Alufo
bgkendall/Alufo
Small split keyboard using stacked one-layer aluminium core boards with an on-board CH552T controller.
94 partsCERN-OHL-S-2.0 - 2 layers209.8 × 147 mm
Kicad miao panel
kilipan/miao
A cheap and hand-solderable drop-in replacement for the XIAO using ch552t
2,645 parts33CERN-OHL-S-2.0 - 2 layers283 × 100 mm
- 2 layers193.5 × 116.6 mm
- 2 layers227.3 × 84.9 mm
- 4 layers100 × 100 mm
FarmMesh Node
chinawrj/FarmMesh-Node
Developing an integrated hardware and software solution for farm-wide Mesh networking: RP2350B/ESP32-C5 nodes, firmware, network protocols, and Wi-Fi/BLE sensor access.
164 parts - 2 layers207.8 × 57.2 mm
Questions
How big is the Kazhan oldCopy PCB?
It measures 143.6 × 139.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Kazhan oldCopy use?
98 parts, built around the CH552T, USBLC6-2SC6 and PMEG2010EA. 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 Kazhan oldCopy KiCad files?
From the tikinson/kazhan repository on GitHub, at the commit this page was made from: the board is kazhan_oldCopy.kicad_pcb and its schematic kazhan.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Kazhan oldCopy 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).