Req. Telephone Cut Off Timer cir?

[ahmed osama]

HI all
any one has Telephone Cut Off Timer circuit??

 

[ashad]

Assalam

my complete project related for the intercom is uploaded on

**broken link removed**


if u need any help then ask

 

[nguyennam]

You can design a monovibrator using timer LM555.

nguyennam

 

[Verba]

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

 

[noufalck]

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