1、 - 1 - 摘摘 要要 在我国应用范围比较广泛的是机械式发条定时器,但在实际应用中所产生 的问题比较多，走时不准，易停摆等问题严重影响定时器的质量。 本文在对机械式发条式定时器其缺点分析的基础上提出了基于数字电路技 术的定时器设计方案。这个定时器电路比较简单，成本低，便于维修，省去了 机械定时器每次必须扭动定时按钮的麻烦，对电器的全自动化很有利。由振荡 器产生方波后经过分频器分别产生周期为的方波，分别用来减计数和加计数， 这两种方波通过计数器后输出 BCD 码，BCD 码通过发光二极管进行显示。 首先，根据设计要求，设计电路原理方框图，然后，通过对电路原理的分 析，对电路元件进行选择并设定相
2、应的电路图元件参数，最后，设计电路的接 线图并对整个系统进行功能测试。 【关键词】【关键词】定时器 发光二极管 定时周期 触发器 计数器 振荡 - 2 - ABSTRACT In the broader scope of our application is a mechanical starting timer in the practical application of issues arising from the relatively more time to walk, stopped easily the timer problems seriously affect quali
3、ty. The mechanical and starting a timer on the basis of the analysis of the shortcomings of technology-based digital timer circuit design. This timer electric circuit quite is simple, the cost is low, it is advantageous for the service , omitted the mechanical timer each time to have to sway from si
4、de to side fixed time the button trouble, was very advantageous to the electric appliance entire automation. Square-wave generated by the oscillator after a cycle frequency divider respectively square-wave for the cycle of 1 minute and 1 second respectively for minus count and increases count, both through the counter after square-wave export BCD code, BCD code through the light-emitting diode display. First, according to designs the request, designs the circuitry block diagram, then,
