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mohdfasieh

help plz

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For a simple smoke detector you could use an MC14467 ic.  Look at page five in this datasheet and it gives you a pretty simple circuit schematic; just a few external components and a piezo alarm. (The chip costs like $1.50 at digikey.com)

Datasheet:
http://rocky.digikey.com/WebLib/Motorola/Web%20Data/MC14467-1.pdf

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