Main components

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Part NumberDescription
74HC08
74HC377
74HC193
74HC11
74HC688
74HC373
74HC04Hex Inverter
74HC00quad 2-input NAND gate
74HC32
74HCT08
74HC74Dual D Flip-flop, Set & Reset

B4 schematic

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B4 board layout

B4 PCB render

Top PCB
Bottom PCB