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本文介绍一种计数式多功能定时器,它采用二进制计数器附加二极管译码网络构成,定时档次有5分钟、10分钟、15分钟、…60分钟,等等。各相邻档次相差5分钟,各档次选择由波段开关实现。这种定时器有单次定时报警功能,循环定时报警功能及延时断电功能。较高的定时精度和方便的设定方式使其适合于会议发言,家庭烹饪及其它需要定时工作的场合。计数式多功能定时器电原理图如图1所示。整个电路由计数译码、延时复位、延时断电和报警执行4个部分组成。下面对各部分的特点和工作情况作一说明。
This article describes a count-type multi-function timer, which uses binary counter additional diode decoding network structure, the timing grade of 5 minutes, 10 minutes, 15 minutes, ... 60 minutes, and so on. The difference between adjacent grades 5 minutes, the grade selection by the band switch to achieve. This timer has a single timer alarm function, cycle timer alarm function and delay power-off function. Higher timing accuracy and convenient settings make it suitable for conference speakers, home cooking and other occasions that require regular work. Counting multi-function timer circuit diagram shown in Figure 1. The entire circuit by the count decoding, delay reset, delay power off and alarm execution 4 parts. The following describes the characteristics of each part and working conditions.