board

65% MX Keyboard (soldered)

Public Unreviewed

by gzc

65% ANSI keyboard PCB (68 soldered MX switches) for a gasket-mount case, rev B: STM32F072 under the spacebar running QMK, USB through a Unified Daughterboard on a Pico-EZmate cable, strict-grid copper, green with lead-free HASL, PCBWay bare board for hand assembly.

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gzc Revision B: soldered MX switches (no hotswap), PCBWay bare board for hand assembly, green mask with lead-free HASL; new… b097cd0 17h ago

Design review

Written by adom-aiflow on 2026-11-10T05:40:51Z for board-39.kicad_pcb (sha256 8320888acaee). The run's own report, step by step: docs/runs/65-keyboard-claude-opus-5-5-20261109-0022/.

Status: finish ran with 2 open item(s); not cleared for fabrication.

Simulation

Current

Net Current (A) Peak density (A/mm²) Layers
VBUS 0.50 40.5 F.Cu, B.Cu
GND 0.50 9.0 F.Cu, B.Cu
+3V3 0.10 12.3 F.Cu, B.Cu

Screens

  • Current screen: passed
  • Thermal screen: passed

The screens and the Fields solve are engineering screens with stated assumptions, not manufacturing or thermal qualification.

Open Fields issues

  • 3 decoupling-far findings, grouped (+3V3); the first: U1 pin 1 (+3V3): the nearest small capacitor, C4, is 3.7 mm away (loop 3.7 mm²)
  • GND: its pour on F.Cu is in 4 pieces (3 joined through vias, 0 isolated); the nearest one (45.6 mm², joined only through the net's vias on other layers) is 0.6 mm from the main piece
  • GND: its pour on B.Cu is in 5 pieces (4 joined through vias, 0 isolated); the nearest one (11.3 mm², joined only through the net's vias on other layers) is 0.7 mm from the main piece

Figures

Adom Fields current and heat screen on the rev B board: VBUS and GND at 0.5 A peak 40 A/mm2, +3V3 at 0.1 A 12 A/mm2, under 1 C rise in still air. The 'no TVS' tag on J2 is expected: ESD protection is on the USB daughterboard.

Adom Fields current and heat screen on the rev B board: VBUS and GND at 0.5 A peak 40 A/mm2, +3V3 at 0.1 A 12 A/mm2, under 1 C rise in still air. The 'no TVS' tag on J2 is expected: ESD protection is on the USB daughterboard.

Components

Part Manufacturer Role Qty References Unit price Line price Links
78171-0004 Molex Pico-EZmate 4P 1 J2 - -
AP2112K-3.3TRG1 Diodes Incorporated AP2112K-3.3 1 U3 - - wiki
CL10A105KB8NNNC Samsung Electro-Mechanics 1uF 3 C1, C2, C8 - -
STM32F072CBT6 STMicroelectronics STM32F072CBT6 1 U1 - - wiki
CC0603KRX7R9BB104 YAGEO 100nF 5 C3, C4, C5, C6, C10 - - wiki
CL10A475KO8NNNC Samsung Electro-Mechanics 4.7uF 1 C7 - - wiki
0603B103K500NT FH (Guangdong Fenghua) 10nF 1 C9 - -
0603WAF1002T5E UNI-ROYAL 10k 1 R3 - - wiki
TS-1187A-B-A-B XKB Connection BOOT 1 SW69 - - wiki
TS-1187A-B-A-B XKB Connection RESET 1 SW70 - - wiki
MX switch, 5-pin or 3-pin (user-supplied) any MX-compatible (your choice) MX_SWITCH 68 SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23, SW24, SW25, SW26, SW27, SW28, SW29, SW30, SW31, SW32, SW33, SW34, SW35, SW36, SW37, SW38, SW39, SW40, SW41, SW42, SW43, SW44, SW45, SW46, SW47, SW48, SW49, SW50, SW51, SW52, SW53, SW54, SW55, SW56, SW57, SW58, SW59, SW60, SW61, SW62, SW63, SW64, SW65, SW66, SW67, SW68 - -
1N4148WS onsemi 1N4148WS 68 D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D32, D33, D34, D35, D36, D37, D38, D39, D40, D41, D42, D43, D44, D45, D46, D47, D48, D49, D50, D51, D52, D53, D54, D55, D56, D57, D58, D59, D60, D61, D62, D63, D64, D65, D66, D67, D68 - -