ALARM system circuit

hii guys .. plz i want help in my project . My project is about an alarm system circuit . so please anyone have any idea plz tell me But i don't want it very complicated i want it simple and any types
but plz for any one want to help me i want the circuit diagram and simple explain to the main idea


And thanks alot

Do you have any designs that people could give advice on? I mean it sounds pretty simple: Switch Completes circuit and alarm sounds.

TrevorP said:

Do you have any designs that people could give advice on? I mean it sounds pretty simple: Switch Completes circuit and alarm sounds.

Click to expand...

I mean any simple design .. yes with sound Or light or the both

Anti_virus_abdo said:

I mean any simple design .. yes with sound Or light or the both

Click to expand...

Attached is something to get you started.

By the way, its not nice to double post.