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google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards

A 4x4 macro-pad with a spectrum analyzer IC
Switch42 is an open-source printed circuit board by zk-phi, from the zk-phi/affinity-keyboard repository on GitHub. It is a 2-layer board of 95.3 × 76.2 mm with 83 parts on 60 nets, routed with 518 tracks and 72 vias.
It is built around the SK6812MINI-E. Its parts include 17 switches, 16 diodes, 16 inductors, 2 ICs and 2 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | C_Small | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | 0.1u, 0.1u, 0.1u, C5, C11, C12, C13, C14, C17, C18, C19, C20, C24, C25, C26, C27 +3 |
| 16 | D | phi-kbd-library:D_SMD-irreversible | D1, D2, D3, D4, D6, D7, D8, D9, D11, D12, D13, D14, D16, D17, D18, D19 |
| 16 | SK6812MINI | phi-kbd-library:SK6812MINI_narrow-irreversible | L1, L2, L3, L4, L6, L7, L8, L9, L11, L12, L13, L14, L16, L17, L18, L19 |
| 16 | SW_PUSH | phi-kbd-library:MX_or_Choc_1.00u-irreversible | SW2, SW3, SW4, SW5, SW7, SW8, SW9, SW10, SW12, SW13, SW14, SW15, SW17, SW18, SW19, SW20 |
| 7 | Val** | phi-kbd-library:M2_SCREW_HOLE | Ref**, Ref**, Ref**, Ref**, Ref**, Ref**, Ref** |
| 3 | R_Small | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | 22K, 22K, 220K |
| 2 | MJ-4PP-9 | phi-kbd-library:MJ-4PP-9-irreversible | J1, J2 |
| 1 | C_Small | phi-kbd-library:Capacitor_Disc_2.50mm-irreversible | 33pF |
| 1 | MSGEQ7 | Package_DIP:DIP-8_W7.62mm_Socket | U2 |
| 1 | ProMicro | phi-kbd-library:ProMicro_Reversed_Conthrough-irreversible | U1 |
| 1 | SW_PUSH | phi-kbd-library:ResetSW-irreversible | SW1 |
It measures 95.3 × 76.2 mm and has 2 copper layers, 1.6 mm thick.
83 parts, built around the SK6812MINI-E. 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.
From the zk-phi/affinity-keyboard repository on GitHub, at the commit this page was made from: the board is pcb/switch42.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask zk-phi before reusing the design.

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Circuit diagrams and firmware source code for Gboard DIY keyboards

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