Req. Telephone Cut Off Timer cir?

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Assalam

my complete project related for the intercom is uploaded on

**broken link removed**


if u need any help then ask
 

You can design a monovibrator using timer LM555.

nguyennam
 

Just any POR circuit capable of counting a few minutes or so.
What are your exact requirements ?
 

y only req is here...no circuits..thought post may b on ckt..
 

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