数字电子技术课程设计--篮球比赛24秒倒计时器设计

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1、数字电子技术课程设计数字电子技术课程设计报告题目：篮球比赛24秒倒计时器设计课程：数字电子技术专业：电气工程及其自动化班级：12电气本一班学号：姓名：指导老师：完成日期：2014年12月19号数字电子技术课程设计课程设计任务书课程名称数字电子技术设计课题篮球比赛24秒倒计时器设计目的1.学习篮球比赛24秒倒计时器的设计方法2.研究篮球比赛24秒倒计时器的设计方案3.灵活应用芯片制作电子产品设计任务用集成芯片制作一个篮球比赛24秒倒计时器设计的要求1.能够实现24秒倒计时2.倒计时结束后有信号灯和蜂

2、鸣器报警3.具有控制计时器的置数、启动与暂停功能设计的步骤1.构思计时器的工作原理2.画出计时器的总原理图及各分电路图3.连接图，进行电路模拟仿真4.编写实验设计报告工作计划1.第一天至第二天，查阅资料，学习了解篮球24秒倒计时器的原理及图形绘制2.第三天至第四天，画出简略草图，并找出绘制所需的原件3.第五天，将各个元器件连接起来，用Multisim软件仿真4.第六至七天，撰写实验报告，并审阅改进数字电子技术课程设计目录1.设计总方案及原理框图···························

3、··················（1）1.1电路设计原理框图·············································（1）1.2电路设计方案设计·············································（1）2.各芯片的用法与功能···············································（1）2.174LS192·········································

4、··············（1）2.2555定时器·····················································（1）3．各部分电路设计····················································（2）3.1信号发生部分··················································（2）3.2数字电子技术课程设计倒计时部分·························

5、···························（3）3.3停止控制电路··················································（3）3.4警报提示装置··················································（4）4．总设计（总电路图）················································（4）5．安装、调试步骤··························

6、·························（5）6．电路仿真调试·······················································（5）7．故障分析与电路改进··············································（10）8．收获与体会························································（10）9．仪器仪表明细清单···················

7、······························（11）数字电子技术课程设计参考文献·····························································（12）数字电子技术课程设计1.电路设计总方案及原理框图1.1电路设计原理框图说明：倒计时功能主要是利用192计数芯片来实现，同时利用反馈和置数实现进制的转换，以适合分和秒的不同需要，倒计时器到零时，通过停止控制电路使计数器停止计数并发出蜂鸣警报。1.2电路设计方案：24秒倒计时的总

8、体方案框图如图所示，它包括秒脉冲发生器、计数器、译码显示电路、报警电路和辅助时序控制电路等五个模块组成。其中计数器和控制电路使系统的主要模块。计数器完成24秒计时功能，而控制电路完成计数器的直接清零、启动技术、暂停和连续计数、译码显示电路的显示与灭灯、定时时间到报警等功能。秒脉冲发生器产生的信号是电路的时钟脉冲和定时标准，但本设计对此信号要求并不高，故电路可采用555集成电路或由TTL与非门组成的多谐振荡器构成。译码显示电路由自带译码器的数码管组成。报警电路在试验中可用发光二极管和