anyone knw photoelectric smoke detector circuit？

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L.rence8

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i'm newbie and nw working on project..but i dun hw photoelectric smoke detector circuit work?anyone got any simple circuit can let me easy understand and built for testing..
 

Re: smoke detector circuit

Here's a student project that has a very simple smoke detector: Untitled 1

Here's a professional version: **broken link removed**

Here's a dedicated circuit: **broken link removed**
 
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It should be noted, that the simple smoke detector doesn't use a suitable sensor method according to the description and can't be expected to give acceptable results. A sensitive smoke detector would measure scattered light and preferably use a pulsed source and AC respectively difference detection.
 

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