1、 1 毕业论文（设计） 数字抢答器数字抢答器的研究、设计的研究、设计 I 摘摘 要要 随着科学技术的不断发展，促使人们学科学、学技术、学知识的手段多种多 样。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。但抢答器的 使用频率较低，且有的要么制作复杂，要么可靠性低，减少兴致。做为一个单位 若专购一台抢答器虽然在经济上可以承受，但每年使用的次数极少，往往因长期 存放使 （电子器件的） 抢答器损坏， 再购置的麻烦和及时性就会影响活动的开展, 因此设计了本抢答器。 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
2、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秒脉冲产生的信号在显示 器上输出实现计时功能，构成扩展电路。 关键字关键字：抢答电路 定时电路 报警电路 时序控制 II ABSTARCT With the continuous development of science and technology, promote learning science, science and technology, knowledge of the variety of means. With a tool for Qiangda, which has been widely used in
3、all kinds of intelligence and knowledge contests occasions. But Qiangda is used for lower frequency, and some production complex or low reliability, and reduced interest. As a unit, if the purchase is a Qiangda .Although the economy can bear, each year the number is extremely small, because of the l
4、ong-term storage (electronic devices) Qiangda for damage to the purchase of the trouble and timeliness of activities, The development will be affected, so this Qiangda is designed . The figure vies for the answering device by the subject circuit and expands the circuit to make up . Have priority in code circuit , latch , decipher circuit and export the input signal of the entrant team on the display; Starting the warning circuit with the control circuit and hosts switch, two the above-mention
