目录
摘要.....................................................................................................................................................3
1 方案选择..........................................................................................................................................4
2、抢答器基本原理电路...................................................................................................................5
2.1 原理与分析...........................................................................................................................5
3、电路元件的选择及参数...............................................................................................................6
3.1 〈74LS148〉........................................................................................................................6
3.2 〈74LS192〉........................................................................................................................7
3.3 〈74LS48〉..........................................................................................................................8
3.4 〈74LS121〉........................................................................................................................9
3.5 〈NE555〉..........................................................................................................................10
3.5.1 NE555 构成的单稳态触发器..................................................................................11
3.5.2 NE555 构成的多谐振荡器......................................................................................11
4、电路设计.....................................................................................................................................12
4.1 单元电路设计.....................................................................................................................12
4.1.1 抢答器电路..............................................................................................................12
4.1.2 定时电路..................................................................................................................13
4.1.3 报警电路..................................................................................................................15
4.1.4 时序控制电路..........................................................................................................15
4.2 整体电路.............................................................................................................................16
5、心得体会.....................................................................................................................................17
6、实物图.........................................................................................................................................19
...........................................................................................................................................................19
7、元器件清单.................................................................................................................................19
8、主要参考资料.............................................................................................................................20
电路图见附页
