CD4013是双D触发器，分别接成一个单稳态电路和一个双稳态电路。单稳态电路的作用是对触摸信号进行脉冲展宽整形，保证每次触摸动作都可-CD4013 dual D flip-flop, respectively connected as a monostable and a bistable circuit. Monostable circuit touch signal pulse broadening shaping, to ensure each touch action can

频率计用51单片机计数器d触发器锁存器组成高精度频率计-Frequency counter with 51 single counter d flip-flop latch constitute precision frequency meter