Smoke Detector Circuit Diagram?

Question

Hi ....

I am engineering student and I want Smoke Detector Circuit diagram and information about it from which i can make project.

Answer 1

This is from the answer given to the undecided question - Circuit diagram for a fire alarm, here at Y!A:

I assume by "fire alarm" you mean a smoke detector?
Here is a circuit diagram for a standalone alarm:
http://www.electronic-circuits-diagrams....
Text that goes with it is on
http://www.electronic-circuits-diagrams....
If you want to integrate a sensor into your existing home automation system, then read this:
http://www.edcheung.com/automa/smoke_det...

I don't know if it'll help, but after a quick web search for a schematic for a smoke detector, I can see why it'd be easy to become discouraged. I wish shops wouldn't use search terms like that to refer to blind links.

Answer 2

So far as I understand it....smoke detectors are stand-alone units operated by batteries. No circuits involved.

Answer 3

I don't... but I imagine the 555 is a trivial part of the design (probably just used for the alarm sound). The hard part of the design is the smoke detector (not sure how they do it).