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

So alpha
Usb board is an open-source printed circuit board by dexterlb, from the dexterlb/protopit repository on GitHub. It is a 2-layer board of 50 × 25 mm with 15 parts on 6 nets, routed with 30 tracks and 0 vias.
Its parts include 7 resistors, 5 connectors, 2 capacitors and 1 diode.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2, R3, R4, R5, R6, R7 |
| 3 | USB_A | usb_connectors:USB_A_CVILUX_VERTICAL | J3, J4, J5 |
| 2 | IN_5V | connectors:1PIN_DG306 | J1, J2 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2 |
| 1 | 100u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C1 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |

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

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It measures 50 × 25 mm and has 2 copper layers, 1.6 mm thick.
15 parts. 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 dexterlb/protopit repository on GitHub, at the commit this page was made from: the board is usb_board/usb_board.kicad_pcb and its schematic usb_board/usb_board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask dexterlb before reusing the design.