Main components

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Part NumberDescription
74HCT125
74HCT74Dual D Flip-flop, Set & Reset
74HC299
74HC193
74HC377
74HC00
74HCT04
74HC244
74HC32
74HC08Quad And2
74HC157Quad 2 to 1 line Multiplexer
74HC74Dual D Flip-flop, Set & Reset

B3 schematic

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B3 board layout