数字电子盲人报时钟论文

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1、目录1设计目的...........................................................................................................................................12设计指标..........................................................................................................................................

2、..13盲人报时钟原理框图.......................................................................................................................14元器件清单........................................................................................................................................25工作进程.........

3、...................................................................................................................................26各工作模块功能原理.......................................................................................................................36.1振荡器原理....................

4、..............................................................................................................36.2时间计数器电路..........................................................................................................................36.3译码驱动电路.....................................

5、.........................................................................................36.4数码管..........................................................................................................................................37各单元模块具体设计和分析..........................................

6、..................................................................37.1振荡器电路..................................................................................................................................37.2时间计数单元...........................................................................

7、...................................................47.2.174LS160芯片.......................................................................................................................47.2.2模块组成.................................................................