Use a timer to achieve single-chip analog doorbell, for beginners SCM, is a good example.

code
....\menling
....\menling.c
....\menling.lnp
....\menling.LST
....\menling.M51
....\menling.OBJ
....\menling.Opt
....\menling.plg
....\menling.Uv2
....\menling_Uv2.Bak
Keil C
......\用定时器设计的门铃
......\用定时器设计的门铃.hex
Last Loaded 用定时器设计的门铃.DBK
用定时器设计的门铃.DSN
用定时器设计的门铃.PWI

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