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.......................................................................................

3、.................................................25工作进程............................................................................................................................................26各工作模块功能原理....................................................

4、...................................................................36.1振荡器原理..................................................................................................................................36.2时间计数器电路.........................................

5、.................................................................................36.3译码驱动电路..............................................................................................................................36.4数码管..................................

6、........................................................................................................37各单元模块具体设计和分析............................................................................................................37.1振荡器电路.......................

7、...........................................................................................................37.2时间计数单元..............................................................................................................................47.2.174LS160芯片

8、.......................................................................................................................47.2.2模块组成.................................................................