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。经过布线、焊接、调试等工作后数字抢答器成形。-Digital Responder extended from the main circuit and the circuit. Priority encoder circuit, latch, decoder circuit will be the team' s output on the display input signal　with the control circuit and the host switch to start the alarm circuit, the above two parts of the main circuit. Timing circuit and decoding circuit through second pulse signal to the monitor output to achieve the timing function, constitute the expansion of the circuit. After wiring, welding, testing and other work forming digital Responder.