电子课程设计报告--宽范围可编程定时器

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1、电子课程设计报告2题目名称：宽范围可编程定时器2姓名：2专业：2班级学号：同组人：2指导教师：评分：南昌航空大学电子信息工程学院2012年11月5日2摘要在已经有了各种高精度和各式的钟表的今天，为什么还需要定时器呢？这是因为定时器和钟表不同，它是一种自动控制设备、能自动地控制电器在规定的时间内启动、停止或变换工作状态，这是一般的钟表等时间计量器所替代不了的。定时器电路在家用电器中常用于延时自动关机、定时、玩具电路及时间控制中。延时自动关机功能可以在各种电子产品中见到。定时功能可用于：电风扇延时控制、照相机延时拍摄等。定时器除了上述用于各种家电之中，它还广泛用

2、于各种工业自动控制设备、甚至军事（定时炸弹）等。本课设的目的是设计一款宽范围可编程定时器，具有脉冲脉宽可调，脉宽二档分频，可设定的定时时间，光电、震动报警功能。该电路能将脉冲发生器产生的时钟脉冲分频输入到后级的计数器中，计数满后驱动报警器报警。此计时器的设计采用模块化结构，主要由以下四个模块组成，即秒脉冲发生器模块、分频模块、计数模块和驱动报警模块。在设计此计时器时，采用模块化的设计思想，使设计起来更加简单、容易、条理清晰，调试起来也更容易。此电路用经典的555振荡器产生信号，通过CD4518分频电路，经过CD4029递减计数，最后驱动报警电路中的LED、音

3、乐芯片和震动马达工作报警。因秒脉冲发生器产生的信号是电路的时钟脉冲和定时标准，而本设计对此信号要求并不太高，故采用555电路组成的多谐振荡器代替。经过反复的仿真、修改和调试，电路工作正常，实现了所有的预设功能。关键字：NE555可编程计数报警2目录前言···································································1第一章宽范围可编程定时器的设计要求··································21.1设计任务及要求··························

4、··························2第二章电路设计原理及方案·············································32.1总体设计思路············································32.2理论分析与计算····················································32.3电路设计························································42.4电路各模块简介······

5、············································42.4.1脉冲发生器电路····················································52.4.2控制电17路··························································52.4.330s计时电路······················································52.5电路方案比较··························

6、······························6第三章电路的焊接与调试··············································83.1电路的安装························································83.2电路的调试························································83.3测试结果分析······················································

7、··8第四章结论和体会···········································9参考文献·······························································10附录1元器件清单······················································11附17录2芯片资料························································12附录3电路原理图···················

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