八路数字抢答器毕业设计

八路数字抢答器毕业设计(6600字)
摘要
本文介绍了一种用74系列常用集成电路设计的数码显示八路抢答器的电路组成、设计思路及功能。该抢答器除具有基本的抢答功能外，还具有定时、计时和报警多重功能。主持人通过时间预设开关预设供抢答的时间，系统将完成自动倒计时。若在规定的时间内有人抢答，则计时将自动停止；若在规定的时间内无人抢答，则系统中的蜂鸣器将发响，提示主持人本轮抢答无效，同时实现报警功能。

【关键词】八路, 抢答器, 设计,定时，计时，报警

Abstract
In this paper, the electric circuit and designing thought of an answering racer based on the common-used series of 74 IC with 8-wire is introduced, and its function is also described. The answering race’s function includes timing, counting, and alarming, besides the basic function of an answering racer. The host sets the provided time for the answering race through the time-setting switch, after this the system will count down the time automatically. If anybody answer the question on time, the counting of time will stop; If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved.
      
【Keywords】8-wire, answering racer, design, timing, counting, alarming
 

目录
前言……………………………………………………………………………………1
摘要（中文）…………………………………………………………………………2
摘要（英文）…………………………………………………………………………3
第1章 设计任务及系统功能简介 …………………………………………………4
第2章 实现的原理与电路 …………………………………………………………5
   2.1数字抢答器总体方框图 ……………………………………………………5
2.2 单元电路设计……………………………………………………………….5
第3章 在设计过程中发现的问题和所做的改进………………………………….12
3.1 选手号码的显示问题 ……………………………………………………..12
3.2所做的改进………………………………………………………………….12
第4章 组装与调试…………………………………………………………………14
4.1 使用的主要仪器、仪表……………………………………………………14
 4.2 电路调试……………………………………………………………………14
4.3 整机电路调试………………………………………………………………14
第5章 所用元器件列表……………………………………………………………16
第6章 改进设想及建议……………………………………………………………17
6.1建议…………………………………………………………………………17
结论………………………………………………………………………………….18
谢辞…………………………………………………………………………………..19
参考文献……………………………………………………………………………..20
附录…………………………………………………………………………………..21