可重复触发单稳态触发器在检测电路中的应用

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＂555＂定时器是一种数模混合中的规模集成电路,它使用灵活、方便,被广泛应用于脉冲的产生、整形、定时和延迟等电路中。由其构成的可重复触发单稳态触发器,能比较方便地得到持续时间更长的输出脉冲宽度。本文介绍了由555定时器构成的可重复触发单稳态触发器的电路构成与工作原理,以人体心律监视电路中失落脉冲检测为例,讨论了其在信号检测电路中的应用,说明在实际生产中,只要将其各个功能加以综合应用,便可得到许多实用电路。

555 timer is a kind of medium-scale integrated circuits,it can be widely used in pulse generating,shaping,timing and delay circuit flexibly and conveniently.Using a repeatable triggered single state flip-flop formed by it,can easily get a longer duration of output pulse width.This paper introduces the circuit component and working principle of repeatable triggered single state flip-flop composed of 555 timer,discusses its applications in detection circuits through a example of heart rate monitor circuit,indicates that we can get many practical circuits in the actual production,as long as its various functions to be integrated applications.