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1、目录1.前言········································································································22总体方案设计····························································································32.1方案论证与比较·································

2、················································································32.2方案的选择·····················································································································53单元模块设计········································

3、····················································63.1各单元模块功能介绍及电路设计···························································································63.1.1秒脉冲发生器·················································································

4、·····························63.1.2定时器·······················································································································63.1.3控制器························································································

5、·······························83.1.4译码电路····················································································································93.1.5显示电路·······················································································

6、····························103.1.6总原理图··················································································································113.2特殊器件的介绍·························································································

7、······················113.2.174LS160····················································································································113.2.274LS153························································································

8、····························123.2.374LS74······················································································································133.2.4CD4511··················································