数码显示抢答器设计

文档编号:JD996   文档字数:11744,页数:27  有开题告和任务书

摘要
 二十一世纪已经进入了信息社会的崭新时代，信息社会的基础是电子技术，它是一门实践性很强的技术学科。随着电子技术的发展它已深入到生活的各个领域，抢答器也不例外。
抢答器已经被普遍使用，而且各个方面的技术已经很成熟。随着数码管的问世，科技的迅猛发展，将数码显示应用到抢答器已经是发展的必然，也是对抢答器功能的一种完善和补充。此次设计以智力和知识竞赛为背景，设计一个有能够优先显示抢答者组号并发出响声提醒，同时封锁其他组的抢答功能的抢答器。此次设计我们通过调查研究可以通过单片机或利用数模电知识的电子技术来完成。单片机虽然具有智能化、可编程等优点但又考虑到单片机造价高，编程难等问题，我们决定用分立元器件来完成。我们利用分块完成，综合连接的方法分别对抢答部分，控制部分，音响部分，直流稳压电源部分进行设计。通过调试，每块功能都没问题后，最后连接组装，综合调试，最终整个设计可以实现主持人复位清零，第一抢答信号的鉴别和锁存，显示抢答者组号，发出蜂鸣声等功能，满足设计要求。

关键字：抢答器 数码显示 抢答电路 定时电路
 

Abstract
 The twenty-first century has already entered brand-new information society times，The information society is based on electronic technology，It is very strong one practicality technology subjects.It already goes deep into each fields arriving at life with the development of electron technology , rush to reply an implement neither exception.
 Rush to reply an implement the technology by be put into use commonly, and each aspect is already already very mature.With the fact that the numerical code coming out , science and technology swiftness and violence develop,one kind applying digital display to the necessity rushing to reply the implement already is to develop , being also to rushing to reply the implement is functional improves and perfects and supplements. Background designing that the contest is with intelligence and knowledge this time, the preferential display designing that one has being able to rushes to reply the person group number and effluence noise warn of , blockade at the same time rushing forming other to reply functional rushing replies an implement. Come to be completed the technology this time, designing that we can pass the monolithic machine by investigation and study or making use of digital-analog electricity knowledge electron. The monolithic machine thinks that cost of construction is high to monolithic machine although having merit such as intellectualized , weave Cheng , the programming is difficult to wait for problem , our to decide to be completed with standing separately coming the component. We make use of partiitoning to be completed , connected synthetical method designs that respectively to rushing to reply the part , control section , audio part , direct-current stabilivolt power source part are in progress. By testing , linking finally after every piece function has no problem, assembling , synthetical debugging,entire ultimate design can realize anchorperson replacement zero clearing , the first grab the be distinguished and lock exist replying a signal , display is grabbed replying the person group number , issue the buzz sound waiting for a function , satisfy design demand.
 

Keywords： rushes to reply implement  digital display  rushes to reply 
 the circuit timing circuit
 
目录
第1章 绪论 1
第2章 方案选择 1
2.1 两种方案简介 2
2.2 方案选择 2
第3章 设计思路框图 3
第4章 设计过程 4
4.1 抢答部分 4
4.1.1 抢答按钮及编码部分 4
4.1.1.1 按钮输入电路设计 4
4.1.1.2 编码部分设计 4
4.1.2 锁存与译码显示部分 7
4.1.2.1 译码器设计 7
4.1.2.2 LED数码管简介 10
4.1.2.3 74LS279触发器简介 11
4.2 控制部分 14
4.3 音响电路 15
4.3.1 555定时器简介 16
4.3.2 电路图及工作原理 17
4.4 稳压电源部分 17
4.4.1 三端集成稳压器简介 17
4.4.2 桥式整流，电容滤波电路 18
4.4.3 直流稳压电源 19
第5章 工作原理说明及焊接调试 20
5.1 工作原理说明 20
5.2 元器件的焊接 20
5.3 电路的调试 22
第6章 元器件清单 23
第7章 总结 24
参考文献 25
致谢 26
附录A电路全图 28

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