抢答器是学校常用的智力竞赛优先判决电路。采用STC89C52单片机为核心设计出具有限时抢答、限时答题、报警显示等功能的八路抢答器。硬件电路中采用继电器把按键信号和单片机信号隔离，提高电路抗干扰能力。结合数据锁存及数码驱动芯片，提高电路带负载能力。利用电路板设计软件Protel，结合元器件实际尺寸设计出易于制作的单面印制板图。最后经过实际制作、使用验证，印制板设计合理、元件插装方便、操作简单、价格低廉，且能及时准确地判断抢答者，效果良好。%Responder is a priority decision circuit commonly used in quiz game of schools. An eight-way responder with time limit answer,answer in time and alarm display functions was designed on the basis of STC89C52 microcontroller. A relay is adopted in the hardware circuit to isolate the key signal and SCM signal,and improve noise immunity of the circuit. The data latches and digital driver chip are combined to improve load capacity of the circuit. According to the actual size of components, the single-sided PCB was designed with software PROTEL. The actual production and verification result show the PCB’s design is reasonable,the element insert is convenient,its operation is simple,its cost is low,and the responder can timely and accu-rately determine who is the first vier.
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