目录
目录..........................................................................................................................................................4
1 引言........................................................................................................................................................6
2 Multisim 说明........................................................................................................................................7
3 单元电路设计........................................................................................................................................9
3.1 可预置报警器总体参考框图如下图所示.........................................................................................9
3.2 脉冲发生电路.............................................................................................................................9
3.3 计数电路:.......................................................................................................................................10
3.4 置数电路...........................................................................................................................................12
3.5 显示电路:.......................................................................................................................................13
总结.........................................................................................................................................................15
谢辞.........................................................................................................................................................16
参考文献.................................................................................................................................................17
附录.........................................................................................................................................................17
原件名称.................................................................................................................................................18
规格.........................................................................................................................................................18
数量.........................................................................................................................................................18
555 定时器..............................................................................................................................................18
555-UIRTUAL........................................................................................................................................18
2...............................................................................................................................................................18
7 段数码管..............................................................................................................................................18
DCD-HEX...............................................................................................................................................18
3...............................................................................................................................................................18
闪光灯.....................................................................................................................................................18
X1............................................................................................................................................................18
1...............................................................................................................................................................18
二-十进制编码器....................................................................................................................................18
74LS147..................................................................................................................................................18
1...............................................................................................................................................................18
单时钟同步十进制加/减计数器............................................................................................................18
74LS190..................................................................................................................................................18
3...............................................................................................................................................................18
双向开关.................................................................................................................................................18