本次设计使用了74系列常用集成电路设计的数码显示八路抢答器的电路组成、设计思路及功能。此次设计的抢答器同时供8名选手或8个代表队比赛，分别用8个按钮S1~S8表示。设置一个暂停，系统复位和抢答控制开关S，该开关由主持人控制。当其中一路抢先接通电路后，装置自动切断其他电路的信号，同时答器具有锁存与显示功能。即选手按动按钮，锁存相应的编号，并在LED数码管上显示，同时扬声器发出报警声响提示。如过倒计时二十秒后无人抢答，系统自动复位，倒计时小于五秒发出报警提示。-This design uses 74 series of common integrated circuit design of digital display circuit eight responder composition, design ideas and functions. The design of the responder for 8 players or 8 teams, respectively, with 8 button S1~S8. Set a timeout, system reset and Responder control switch S, the switch is controlled by the moderator. When one of the first circuit is switched on, the device automatically cuts off the signal of the other circuit, and the device has the function of latch and display. The players press the button, the corresponding number of latches, and display in the LED digital tube, and the loudspeaker alarm prompt. As the countdown twenty seconds after no one answer, the system automatically reset, less than five seconds countdown alarm prompt.