555 timer is a medium scale integrated device is a combination of analog and digital functions, the experiment based on Proteus software. 555 timing by using the buzzer chirping when long to feedback.

09 555的应用
............\555定时器实验.DSN
............\555定时器实验.PWI
............\code
............\....\9
............\....\9.c
............\....\9.lnp
............\....\9.LST
............\....\9.M51
............\....\9.OBJ
............\....\9.Opt
............\....\9.plg
............\....\9.Uv2
............\Keil C
............\......\555定时器实验
............\......\555定时器实验.hex
............\Last Loaded 555定时器实验.DBK

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