在家用电器及工业自动控制中,经常要求设备运行一段时间,停止一段时间,再运行一段时间,再停止一段时间这样反复循环运行。要完成这种控制就需要一种循环开关定时器。而目前市场上的产品多为单向定时器,无法完成上述控制。为此,本文提出了一种简单、实用,容易制作的循环开关定时器,具有较高的实 In household appliances and industrial automation, equipment is often required to run for a period of time, stop for a period of time, and then run for a period of time, then stop cycling for a period of time. A cycle switch timer is required to accomplish this control. At present, most of the products on the market are one-way timers, and the above control can not be completed. To this end, this paper presents a simple, practical, easy to make cycle switch timer with high real