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agree with steve
i think this is what ur looking for
http://circuitzoo.com/2010/05/20/el...ector-circuit-diagram-design-using-tda2002-ic
I suggest this one coz it uses easy to get parts.
@davenn
The ckt I gave above doesn't use any specialized sensor IC but easy to obtain parts. Since he's asking for a simple circuit I thought he'll be better off with it.
@davenn
@l.rence8
Whichever you make, do a thorough testing before using it in your building.
No! Don't use it in your building.
Not unless you're using it in addition to a UL-or-equivalent-rated smoke detector. It's okay to put it up as a project experiment, but it's NOT okay to use a first-time homemade project as a life-safety device.