八路抢答器原理是怎样?? 8人抢答器的制作原理和过程说明是怎样的?

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Abstract\uff1a


In this paper, the electric circuit and designing thought of an answering racer based on the common-used series of 74 IC with 8-wire is introduced, and its function is also described. The answering race\u2019s function includes timing, counting, and alarming, besides the basic function of an answering racer. The host sets the provided time for the answering race through the time-setting switch, after this the system will count down the time automatically. If anybody answer the question on time, the counting of time will stop; If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved.


Keywords:


8-wire, answering racer, design, timing, counting, alarming




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\u8868\u4e00



(2) \u5b9a\u65f6\u7535\u8def

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\uff0c


\u4e8e\u662f\u4eceNE555\u76843\u7aef\u8f93\u51fa\u7684\u8109\u51b2\u7684\u9891\u7387\u4e3a


\uff0c\u7ed3\u5408\u6211\u4eec\u7684\u5b9e\u9645\u7ecf\u9a8c\u53ca\u8003\u8651\u5230\u5143\u5668\u4ef6\u7684\u6210\u672c\uff0c\u6211\u4eec\u9009\u62e9\u7684\u7535\u963b\u503c\u4e3aR1=15K\uff0cR2=68K\uff0cC=10uF\uff0c\u4ee3\u5165\u5230\u4e0a\u5f0f\u4e2d\u5373\u5f97 \uff0c\u5373\u79d2\u8109\u51b2\u3002

  电路原理如附图,它由IC1和一个编码开关以及控制器等组成。编码开关是由IC1中的输入端A、B、C、D与二极管和按键组成。验证编码开关是否正确,只要按住任意一个按键。使它有一个正电平输入,数码管就会显示相应的数字来。A、B、C、D这四条编码线。分别是1、2、4、8。3则是由1+2同时输入一个正电平获得,5则由1+4获得,6则由2+4获得,7则由1+2+4获得,二极管是起反向截止作用的。

  控制器是由可控硅和IC1的控制端(IC1的⑦、①、②、⑥脚)构成。当任意按下一个按键时,可控硅都会被触发导通,使IC1的控制端始终保持有一个高电平的输入.因此所按的数字得以锁存。这样,后按下的按键就不能起作用,数码管就只显示先按下的键号。

  这里的可控硅另一端与音乐片的正极相连。当可控硅导通时,使音乐片得以通电发声。从而完成整个抢答功能。该音乐片上电即能触发,也能自动停止,因此无需设暂停键。

  当按下复位键时。可控硅被切断电源而截止,IC1的控制端则由高电平转变为低电平而清零。为下一次抢答做准备。



用74ls138优先编码,刚好八路,编码器会优先编出第一个抢答者的编号,然后输出到译码器进行译码显示到数码管。。。

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