这是一个六人抢答器的原理图，使用Proteus 6.9 SP4所画的，具有倒计时、复位、清零功能，希望对大家有所帮助.-This is a schematic of a six-Responder, use Proteus 6.9 SP4 painting, with a countdown, reset, and clear function, we want to help

OpenPilot circuit document