This paper presents a digital circuit produced using digital multifunction Responder, which mainly uses a series of 74 commonly used integrated circuits, in addition to its basic function of answer, but also has the function of timed alarms, digital display functions When the answer in the beginning, the system will automatically count down, and the time can be preset, someone answer period, then the system will stop timing, if nobody answer period, the alarm system will be brief, suggesting that the end of the answer. Keywords: microcontroller, PLC, answer, alarm, digital

八路扫描式抢答器设计.doc
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