Here is five burglar alarm circuits for you can look as idea To protect their property from thieves. simple switching, vibration systems, touch-sensitive.
This is door alarm circuit when forget shut the door,switch stick at the door, if do not shut the door switch will off , will have voice warn loudspeaker
When steal open automobile door relay K1 and K2 work make have voltage 12V give radio transmitter and origin sound part for mix radio waves steal will deaf anything sound.…
This circuit can prevent a car theft. By the delaying them, not to steal our cars easily.