完成日期 2008 年 12 月 30 日
湖南省娄底职业技术学院教务处制
目 录
【摘要】:..................................................................................................................................................................3
前言...........................................................................................................................................................................3
1.数字钟的组成和基本工作原理............................................................................................................................4
1.1 振荡器................................................................................................................................5
1.2 分频器电路........................................................................................................................5
1.3 计数器................................................................................................................................5
1.4 译码显示电路...................................................................................................................6
1.5 校时电路............................................................................................................................6
1.6 报时电路............................................................................................................................6
2.设计步骤与方法....................................................................................................................................................6
2.1 振荡电路............................................................................................................................6
2.2 分频器电路........................................................................................................................7
2.3 计数器................................................................................................................................8
2.3.1
计数器六十进制的接法
..........................................................................................................................8
2.3.2
二十四进制计数器的接法
......................................................................................................................8
2.4 译码显示电路..................................................................................................................10
2.5 校时电路..........................................................................................................................12
2.6 整点报时电路..................................................................................................................13
2.6.1
控制门电路部分
....................................................................................................................................13
2.6.2
音响电路部分
........................................................................................................................................14
3.组装与调试..........................................................................................................................................................16
3.1 接通电源逐步调试..........................................................................................................16
3.2 按顺序对电路连线和调试..............................................................................................16
4.结束语..................................................................................................................................................................16
5.附录u.....................................................................................................................................................................17
6.参考文献..............................................................................................................................................................18