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1、多路电子抢答器摘要数字抢答器由主体电路与扩展电路组成。优先编码电路、锁存器、译码器电路将参赛队的输入信号在显示器上输出;用控制电路和主持人开关启动报警电路构成主电路。在通过译码电路和定时电路将秒脉冲产生的信号在显示器上输出显示计时功能构成扩展电路。在经过安装、调试等工作后数字抢答器形成。抢答器的四周有安装孔,可以方便的安装在操作台上,外接抢答按钮接入相应的接线端子,如果外接电铃或指示灯这接入继电器端子,抢答器的电源为9到15伏直流输入。抢答器通电后,电铃器响,三个数码管显示0,按下复位按钮后进入正常工作状态,开始设置抢答倒记时时间,只要按动十进制编码
2、按钮分别对时间的十位和个位设定,设定的时间在数码管上实时的显示出来,设定时间范围为:0到99秒,设定时间后,就可以按动开始按钮,表示抢答开始,电铃发出0.1秒的声响,提醒选手开始抢答,同时倒计时开始计时。若在抢答时间内有人抢答,则数码管立即显示抢答选手编号,同时电铃响1秒,继电器吸合1秒,表示有人抢答,在答题时间内只有复位键有效,其他按键都无效,这时只有主持人按下复位键后,才能进入下一轮,。若在抢答时间内无人抢答,则再倒计时器计到0时第三组数码管显示0,表示无人抢答蜂鸣器想2秒继电器吸合2秒,这时除了复位键外,其他按键都无效,要进入下一轮抢答要主持人
3、按下复位按钮。关键词:抢答器电路、定时电路、报警电路、时序控制AbstractDigitalResponderfromthemaincircuitandexpansioncircuit.Priorityencodercircuit,latch,decodercircuitteaminputsignalonthedisplayoutput;withhostswitchingcontrolcircuitandmaincircuitstartalarmcircuits.Inthedecodingcircuitandtimingcircuitbythesec
4、ondpulsegeneratoroutputsignalonthedisplayshowsthecircuittimingfunctionsthatformtheextension.Afterinstallationandcommissioningworkformeddigitalansweringdevice.Responderisinstalledaroundthehole,canbeeasilyinstalledintheoperatingtable,addtheappropriateanswerinthebuttonaccesstermin
5、al,iftheexternalbelloralightthataccessrelayterminals,answeringdevice'spowersupply9-15VDCinput.Responderpower,thebellsringdevice,thethreedigitaldisplay0,presstheresetbuttontoenterthenormalworkingstate,begantosettheanswerincountdowntime,aslongasthebuttonpressingthedecimalencoding
6、oftime10,respectively,andabitsetset,setthetimeonareal-timedigitalcontrolisdisplayed,setthetimerange:0-99seconds,setthetime,youcanpresstheStartbutton,saidtheanswerinthebeginning,thesoundofbellsgiven0.1secondstoremindplayersbegantoanswerinthesametime,startthecountdowntimer.Ifthea
7、nswerintheanswerintime,itwas,thenthedigitalcontrolimmediatelydisplayansweringplayernumber,whileelectricrings,onesecondandrelay1second,thatsomepeopleanswerin,theanswertime,onlytheresetbuttonandeffective,theotherkeysareinvalid,thisPresstheresetbuttononlywhenthehostonlyafterthenex
8、tround.Ifnoanswerintheanswerintime,thenagaincountdownt