Quantity   Component name
1 × 74HC04 Hex inverter
6 × 74HC4511 BCD to 7-segment decoder
6 × 74HC4002 Dual NOR4 gate
6 × 74HC86 Quad XOR2 gate
1 × NE555 The keeper of time
6 × 74HC161 4-bit binary counter with sync. parallel load