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The curriculum design is to design a long period of time from time to time (1 hour or more) circuit. The circuit is the core of the 2 parts, an adjustable duty cycle square wave generator circuit the other is the time control circuit. Application of these two parts of the main components are 555 timer, an adjustable duty cycle square wave generator is the application of 555 timer circuit connected Multivibrator, time control circuit is connected to the application of 555 timer monostable trigger browser. The long timer clear design, circuit connectivity is simple, cost-effective, there are great practical value.