Does not appear after the simulation, according to the corresponding for bosses to solve

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refer to the original poster geliyin response:

does not appear after the simulation, according to the corresponding for bosses to solve

Digital tube is with Yin level, digital tube grounding resistance should be answered in the previous 74548 between output and input digital tube, 7, 300 to 1 k resistor can, digital tube dp period of dp can not meet