Smoke Detctors

I am Going To design Smoke Detector Please Suggestions..!!!

I want To Use such Combination When Any Wire of external point( Smoke Detector )
has lost the connection with the main circuit due to any reason Buzzer Must Ring

I often see a light detector being used as a smoke detector. That works by an LED emitting light in a small dark container. Because smoke consists of small particles you can detect when smoke enters the container using an LDR or a phototransistor facing the LED.

I have attached a simple (badly) drawn picture of the concept. The LED and LDR are facing eachother and the cardboard or paper is painted black on both sides so no light from the outside can come into the device.

I have an absolutely brilliant idea for you !

How about googling "Smoke Detector Circuit" ?

You just might be able to find a large number of smoke detector circuit diagrams, and many superbly clear explanations of how they work.

Hi.
If You need info about smoke detectors please use google ...
But if You need some idea ...
1) You can detect CO or CO2 and there are many detectors You can use.
2) LED detection good idea but You have to detect IR LED and RED Led or sometimes UV LED ... not only RED LED

If You want for experimental use it is good idea...
But if You need use them in a professional installation ... forget it. Too many restriction, norms, etc.

Best regards
Mark

When I worked for Motorola and then Freescale we made these chipsets for all the major players - the pricing got to be so low and every opportunity was hand to hand combat.. in other words there was no margin in the business. Are you doing this to get into the smoke detector business or just for fun to see if you can do it? I dont have much free time any more so I would likely go to the store and buy a smoke detector for under 10 dollars and be done with it if it were me.
The company in china who makes most of the chipsets was bought by microchip. there is not much to "design" the IC has integrated most of the functions - the detectors have some radiation in them so playing around with that stuff is not recommended unless you have already had kids and dont mind visits by the NRC to see what you are doing with the material... if you are making smoke detectors commercially you have certifications to contend with CSA, UL etc...
the way to wind up with a million dollars in the smoke detector business is to start out with 2 million dollars and dont stay in too long! See the link below - I dont want to discourage you however it is what it is.

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2018&mcparam=en553551

You could train a dog to bark when it smells smoke

Buy one, draw the schematic, remove the components, make a PCB, install the parts, test.