89C51单片机号音自动播放器的设计机关、院校日常作息需要计时和号音提示，笔者利用AT89C51型单片机和LM386型音频功率放大器构成了自动计时和号音播放器，成本低，效果好，值得推广-No. 89C51 single-chip audio jukebox design agencies, institutions need to time their daily routines and its tone suggested that I use AT89C51-type single-chi