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1、学年论文基于AllegroSPB的八路抢答器电路板的设计与仿真BasedontheAllegroSPBEight-channelrespondercircuitboarddesignandsimulation【摘要】介绍了数码显示八路抢答器电路的组成、设计及功能，电路采用74系列常用集成电路进行设计。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
2、发响，提示主持人本轮抢答无效，实现报警功能，若超过抢答时间则抢答无效。该抢答器主要运用到了编码器，译码器和锁存器：它采用74LS148来实现抢答器的选号，采用74LS279芯片实现对号码的锁存，采用74LS192实现十进制的减法计数，采用555芯片产生秒脉冲信号来共同实现倒计时功能，采用74LS121单稳态芯片来实现报警信号的输出。通过课程设计提高和巩固了所学的专业知识，以及知识的综合应用和焊接技术。【关键词】抢答器编码译码定时报警[Abstract]Introducesdigitaldisplay,des
3、ignandfunctionofeightRespondercircuit,circuitusing74seriesofcommonintegratedcircuitdesign.Theresponderadditiontoabasicfunction,alsohasthetiming,timingandalarmfunction.Thedefaulthostforswitchingthedefaultanswertimebytime,thesystemwillcompletetheautomaticcou
4、ntdown.Ifthestipulatedtimesomeoneviestoanswerfirst,thenthetimewillautomaticallystop;ifnobodyanswerthequestionontime,thesystemwillsendthebuzzerrang,indicatingthatthehostthiscontestnullandvoid,realizealarmfunction,ifmorethantheansweranswerinvalidtime.Theresp
5、onderisusedmainlytotheencoder,decoderandlatch:ituses74LS148toachieveResponderselection,thenumberoflatchesusing74LS279chip,using74LS192toachievethesubtractioncountingdecimal,using555chiptoproducethesecondpulsesignaltorealizethecountdownfunction,toachievethe
6、outputalarmsignalusing74LS121monostablechip.Throughcoursesdesignedtoenhanceandconsolidatetheknowledgeofprofessionalknowledge,aswellasthesynthesisandapplicationofknowledgeofweldingtechnology.[keywords]Respondercodingdecodingtimingalarm目录引言..................
7、..........................................................................................................1一八路抢答器设计与要求........................................................................................2二八路抢答器电路原理和设计....................................
8、............................................22.1八路竞赛抢答器原理...................................................................................22.1.1八路竞赛抢答器电路框图...................................................
