hi im a college student from philippines,
im just wondering if someone knows or have a circuit design for a smoke alarm.,,just a simple circuit.,,can someone please give me a sample circuit or a site that discuss about alarms and have sample circuits...
i also need a simple circuit design using mq5 sensor/LPG leak sensor.,,

please anyone who can help..,
thanks..,

 

Hello.

Any information you have on the sensor (or a datasheet, ideally) would be most helpful.

 

ahhh...im still searching..,but maybe this site can help you..,http://www.discovercircuits.com/A/alarms1.htm

i found some intersting circuit on that site.,hope it could help you.,

 

Try these seaches:
http://www.google.com/search?hl=en&q=smoke+alarm+schematic
http://www.google.com/search?hl=en&q=smoke+detector+schematic