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中央电视台在1983年播出了北京中学生史、地智力竞赛和大学生英语竞赛。史、地是六位同学参加(六个学校),英语是八位同学参加(两所大学)。在每位同学的桌前都安装了抢答按钮,抢答装置是一个时间选择器。在竞赛时,它能从几个学校中选择出一个学校。使用方法是:谁先按下桌前的按钮,把电路接通了,谁就得到抢答权。为了达到这一目的,我们在设计电路时采用了TTL集成电路。图1(a)
CCTV broadcast the Beijing History of Secondary School Students, Quiz and English Contest for College Students in 1983. History, place is six students (six schools), English is eight students (two universities). In each classmate’s desk have installed the answer button, answer device is a time selector. It can choose a school from several schools during the competition. The use of the method is: who first press the button on the table, the circuit connected, who will get the right answer. In order to achieve this goal, we used the TTL integrated circuit when designing the circuit. Figure 1 (a)