数字电子技术课设多路智能竞赛抢答器设计（常用版）(可以直接使用，可编辑完整版资料，欢迎下载）多路智能竞赛抢答器设计摘要抢答器作为一种工具，已广泛应用于各种智力和知识竞赛场合。在竞赛、文体娱乐活动（抢答活动）中，能准确、公正、直观地判断出抢答者的机器。通过抢答者的指示灯显示、数码显示和警示显示等手段指示出第一抢答者。抢答器多向着数字智能化发展。数字抢答器由主体电路与扩展电路两大部分组成：优先编码电路、锁存器、译码电路将输入信号显示；用控制电路和开关启动报警电路，以上两部分组成主体电路；通过定时电路和译码电路将脉冲信号在显示器上输出实现计时功能，构成扩展电路。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。关键字：抢答器锁存器报警电路译码电路AbstractViestoanswerfirstdeviceasatool,hasbeenwidelyappliedinallkindsofintelligenceandknowledgecompetitionsituation.Inthecompetition,entertainmentactivities(viestoanswerfirstactivities),canaccurate,objective,intuitivetodiagnosetheviestoanswerfirstthemachine.Throughthedisplay,theindicatorofviestoanswerfirstdigitaldisplayandalarmdisplay,andothermeanstoindicatethefirstviestoanswerfirst.Themoretowarddigitalintelligentviestoanswerfirst.Themaincircuitbydigitalviestoanswerfirstandexpandingthecircuittwomaincomponents:prioritycodingcircuit,latches,decodercircuitwillinputsignaldisplay;Usethecontrolcircuitandtheswitchalarmcircuit,theabovetwopartssubjectcircuit;Wheninthecircuitanddecodethecircuitwillpulsesignalonadisplayoutputoftimingfunction,constituteexpansioncircuit.Inadditiontobasictheviestoanswerfirstviestoanswerfirstfunctionoutside,stillhavetiming,timingandalarmmultiplefunctions.Bythetimethedefaultdefaultforviestoanswerfirstthetimeswitch,thesystemwillcompleteautomaticcountdown.Keyword:viestoanswerfirstthelatchesalarmcircuitdecodercircuit目录TOC\o"1-3"\h\uHYPERLINK\l_Toc2357多路智能竞赛抢答器设计PAGEREF_Toc23571HYPERLINK\l_Toc2506摘要PAGEREF_Toc25061HYPERLINK\l_Toc30651AbstractPAGEREF_Toc306512HYPERLINK\l_Toc28617一、工作原理PAGEREF_Toc286175HYPERLINK\l_Toc202661、原理框图PAGEREF_Toc202665HYPERLINK\l_Toc293992、主要芯片介绍PAGEREF_Toc293996HYPERLINK\l_Toc14615三、电路设计PAGEREF_Toc146159HYPERLINK\l_Toc118921、主体电路设计PAGEREF_Toc118929HYPERLINK\l_Toc87562、扩展电路PAGEREF_Toc875611HYPERLINK\l_Toc1757（1）定时电路PAGEREF_To