Other than the family dog, the most basic burglar alarm is a simple electric circuit built into an entry way. In any circuit, whether it 's powering a flashlight or a . - This circuit helps you to guard your precious do.ents as well as jewellery from intruders or theft. Read this post for its circuit diagram and . - Here is five burglar alarm circuit for you can look as idea To protect their property from thieves. simple switching, vi.tion systems, .