I need a simple anaolg saftey circuit

[Haytham-Sief]

Plzz everbody , I need a saftey simple analog IC circuit using transistors or op-amps. But plzz the saftey circuit should not include IR as the IR recievers are not avaliable here in the local market. I need ideas about any saftey system i.e. nothing specific is required.

 

[truebs]

Please be more specific ,for what are you lookin safety circuit ?
Is it door alarm or Electrical isolation ? what is your application !

If you don't want to use IR certainly RF waves are the best alternative , 555 timer can be used in number of safety applications .

You can also use LASERS if you get in local market for this purpose.

 

[Haytham-Sief]

I need a saftey circuit against thefts for example or rain , fire.

 

[truebs]

Well each of the safety circuit you mentioned would require different designing.

For eg. For Designing a fire safety system you can have following prototype :
1. Temperature sensor interfaced to 8052 microcontroller and then program it to take appropiate action thereafter.
check :www.sp.se/fire/Eng/Research/Fire_safety_electronics.htm

2. For theft you can try and search Anti-burglar alarm at google ,also i've found one circuit for this at
www.electronicsforu.com (if you don't get it please PM me so that i'll send you )


Also Check out :
www.electronic-circuits-diagrams.com/main.htm

Cya !

also check "www.firstalert.com" for some ideas