i want to make a fire alarm system for a low cost.
You want a whole building system or just one room? Here's the first thing I found:http://www.electronic-circuits-diagrams.com/alarmsimages/alarmsckt13.shtml L
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1 room with pullstation and strobe alarm. that link isint so good
You just want "an alarm" then, not a fire-specific one. All you need is to get the parts and assemble them, do you know where to get pull stations, wire and strobe alarms? L
no 1 alarm and pullstation but a fire alrm type
That's a short comment. I'll take "no" to mean that you don't know where to get things? I had a quick look: http://www.cooperfire.com/jsb-products/ul-range/addressable-pull-stations/addressable-pull-stationshttp://www.cooperfire.com/jsb-products/ul-range/horns-strobes L
Those are going to be REALLY expensive!!!Go look on eBay. I bought a FireLite BG12 pull station for $15 BRAND NEWand a wheelock horn strobe + strobe for $15 all together too!Then I bought a 12V AC adapter and I was GOOD TO GO :DI built a PVC stand for the pull station and Horn + Strobe, ran the wiring inside.It cost me less than $40!!!!