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1、数字电路课程设计报告设计课题题目:多路智力竞赛抢答器 专 业: 通信工程 班 级: 姓 名: 学 号: 设计时间: 2010年11月 一、设计目的1、巩固和加深对电子电路基本知识的理解,提高综合运用本课程所学知识的能力。2、培养根据设计需要选学参考书籍,查阅相关手册、图表和文献资料的自学能力。3、通过电路方案的分析、论证和比较,设计计算和选取元器件、电路组装、调试和检测等环节,初步掌握简单实用电路的分析方法和工程设计方法。4、学会简单电路的实验调试和性能指标的测试方法,提高学生动手能力和进行数字电子电路实验的基本技能。二、技术指标1.在主持人宣布下,四组参与抢答。(此时组号无显示)。2.当有抢
2、答者首先按下抢答开关时,相应显示灯亮并伴有声响、并且显示其组号。同时,抢答器不再接收其它组的抢答干扰。三、元件清单元件电阻电容芯片开关LED灯其他型号1k7.5k1000.01u10u74LS175、74LS20、74LS00、74LS148、74LS48、74LS04、555按钮开关排针红色蜂鸣器、共阴数码管四、电路框图3CP模块抢答模块显示模块12声音模块五、单元电路的设计1. CP模块工作原理:该模块为由555定时器构成的多谐振荡器。参数计算:T1 =(R1 +R2)Cln2 、T2 =R2Cln2,电路的振荡周期为T=(R1 +2R2)Cln2。当如图选用R1 =7.5K、R2=7.5
3、K、C=10uF,由T =(R1 +2R2)Cln20.1575s即f6.3Hz。注:该模块是产生给抢答模块的CP信号,产生的CP信号对占空比没什么要求,频率只要适当大,使之可以即时反应抢答者的按下动作就可以了。2. 抢答模块工作原理:四D触发器74LS175输出端Q0Q3控制led灯显示,输出端P0P3控制显示模块显示组号,P0P4与非后产生SHOW信号控制显示模块中74LS48的BI/RBO,使48可以接受输入,这就完成复位时无显示的功能。将与非后的信号再非一次后产生HOLD信号,该信号用于控制声音模块。HOLD相当与使能端控制CP的输入,以此达到有人抢答后其他人无法抢答的功能。3.显示模
4、块工作原理:该模块为组号显示模块,由74LS148 8线-3线八进制优先编码器将4路信号编译成3位二进制数,再由74LS48 七段共阴数码驱动器控制共阴数码管。由抢答模块的SHOW信号控制模块中74LS48的BI/RBO使数码管在没人抢答或复位时无显示。 3. 声音模块工作原理:由74LS20构成的门电路接收抢答后报警信号HOLD。六、调试方案1.先将抢答模块接好先,这时的CP信号可以先接到实验装置上的1KHz信号,TIMEOUT信号接高电平,接好线,测试可否正常抢答,14抢答开关断开时对应的LED是否显示正常,抢答后其他人能否抢答和复位是否正常。 2.接上显示模块,测试可否显示对应组号,未抢
5、答时和复位有无显示。 3.接好CP模块,代替接到实验装置上的CP,测试是否有产生信号,是否可以使抢答模块正常工作。 4.对整个电路的功能测试一遍。七、总电路图八、PCB图九、问题及解决 问题:部分线路由于腐蚀时间过长而断路。解决:增加跳线修复电路。问题:在第一次调试时显示模块无法正常显示。解决:发现显示模块的三块74LS04未连接VCC 导致数码管显示错误,增加跳线后显示正常。十、心得体会。掌握译码器、十进制计数器、555等器件的逻辑功能和工作原理,并对各种元器件的功能和应用有所了解。掌握对数码管管脚的检测。设计各单元电路,画出抢答器的整机逻辑电路图,掌握智力抢答器的工作原理及其设计方法,。并
6、能对其在电路中的作用进行分析。Opinions and suggestions on the partys mass line educational practiceAccording to the central and provincial, municipal unified deployment, according to municipal Party committee about carrying out the partys mass line educational practice activity in the citys implementation opinions
7、, the spirit of the partys mass line educational practice activities from 20* in January to 99 months, carried out at all levels of departments and directly affiliated institutions and grass-roots party organizations. According to my actual County, the county to carry out the education practice put
8、forward the following implementation opinions.First, the overall requirementsCounty county education practice to the eighteen Party of eight, the spirit of the the third Plenary Session of the 18th CPC Central Committee as the guidance, conscientiously implement the spirit of general secretary Xi Ji
9、nping book series of important speech, earnestly implement the Central Committee really, opinions and advice , party implementing the guiding ideology of opinions to determine the objectives and requirements, step method, in accordance with the look in the mirror, dress up, wash bath, cure treatment
10、, the general requirements of for the people pragmatic honest people as the theme, in carrying forward the spirit of Zhuanglang Zhuang, improve their work style, service to the masses of the people, the foundation of consolidating grassroots, promote transformation across efforts, to further impleme
11、nt the central eight regulations and The opposition party and government austerity waste regulations , double section provincial regulations, municipal provisions of the twelve plan and the implementation measures for on improving the work style of close ties with the masses law, highlight style bui
12、lding, carry out the whole wind spirit, resolutely oppose formalism, bureaucracy, hedonism and wasteful extravagance to solve the problems, Party members and cadres of the style and the masses of people strong, the Ministry of Party members and cadres to further improve their thinking and understand
13、ing, to further change the style of the wind, the masses to close, honest and pragmatic people honest image to further establish the foundation to further reinforce the basic level. Style of the building of the new results to promote the construction of a powerful force of the county and the ecologi
14、cal culture of the county and county construction.In educational practice activities of the unit is mainly: the county and below county departments under the organs, enterprises and institutions directly under the township, street, and community, village, non-public economic organizations, social or
15、ganizations and other grass-roots organizations. Agencies and branches, each single unit, follow the rules on internal institutions. Educational practice with step by step.To adhere to the county leadership, leadership and leading cadres to focus on outstanding catch to directly contact the service
16、of the masses of law supervision departments and window units, service industry, educational practice, pay attention to grasp the heavy towns, streets and villages, community education activities and the masses of grassroots groups in close contact to strengthen, and the majority of Party members, c
17、adres and the mass line line Marx doctrine view of the masses and the partys education.Always speak seriously as a basic attitude, adhere to positive education, to carry out criticism and self criticism group, adhere to the pragmatic, more emphasis on leadership, pay more attention to the layers of
18、the demonstration, more focus on the four winds, solve the problem, pay more attention to open the door, the participation of the masses, pay more attention to the classification guidance. Orderly, pay more attention to the cooperation and cohesion driven, more strict requirements on injection, real
19、ly supervision practice, ensure education practice is not empty is not empty is not partial, not as a mere formality.Two, the key point of the taskThe main task of the countys education practice is to seize against four wind this focus on centralized solve outstanding problems asked County, township
20、 leadership and leading cadres of the four winds, the disadvantages of the style, scale behavior to a large scale investigation, overhaul, cleaning greatly. At the same time, respond to the concerns of the masses, safeguard the interests of the masses, pay attention to solve practical problems, solv
21、e the people around the unwholesome tendencies especially on eat, take the card, Yong lazy luxury, extravagance and waste fees, privileges and other issues, timely and effective, without any discount to solve, to improve the style of real implementation of the requirements of real to the grassroots,
22、 real let group Benefit the public.(a) focus on solving the four winds outstanding issuesThe central and provincial requirements, the county leadership and leading cadres of key performance concept is not correct, do not dare to play, to engage in image project, political project, a leadership guide
23、, a set of ideas, orders and prohibitions, and a policy, there are countermeasures county. The units directly under the heavy focus on solving Yung lazy drag, buck passing skin, work is not implemented, the service is not active. The dynamic problem of law enforcement and supervision departments and
24、 window units, service industry mainly solve the door hard, ugly face, something difficult, and arbitrary charges, fines, levies, and breach of privilege, chinakayao, not the problem of law. The township, street The collar of leading bodies and leading cadres to solve key does nottheir own condition
25、s to develop the correct road, the maximum to avoid investment risk, gain profit.(three) vigorously promote the brand. To establish brand awareness, awareness of the use of brand, brand value, brand acquisition performance, enhance the competitive strength. Concentrated manpower, careful planning, p
26、ackaging and publicity of a number of unique, market influence and coverage of the brand, the implementation of key breakthroughs, to enhance the competitive strength, walking business road the competition of alienation and characteristics, the pursuit of stability and development of the market.(fou
27、r) to promote the integration of resources. To further broaden their horizons, effective integration of resources within the group, the city resources, other industries and regional resources, mutual trust, mutual benefit, seeking win-win principle, in the framework of national policies and regulati
28、ons, strict inspection and argumentation, legal consultation, examination and approval procedures, strict regulation of economic activities, attract injection the social investment to the industry group, to achieve leveraging the development, ensure that the value of state-owned assets.(five) to str
29、engthen the construction management personnel. Strengthen the management of education and training of cadres and workers of the existing business, firmly establish the concept of the market, enhance the sense of crisis to adapt to market competition, the sense of urgency, improve the ability to resp
30、ond to market competition, improve management and operation of the market. At the same time, according to the need of industrial development, vigorously the introduction of high-quality management management personnel, and strive to build a high-quality professional management team, hard work, and p
31、romote the entire workforce knowledge structure, age structure, structure optimization and upgrading ability, enhance core competitiveness, adapt to the need of market competition.(six) seriously study the policy for policy. Serious research about social support the development of cultural undertakings in the country and the XX policy, especially the policy of industrial development, financial investment policy, financial policy and tax policy, and actively seek policy, projects and funds, enterprise and industry group mission to promote leapfrog development.9
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