The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool-proof,remotely operated alarm/electromagnetic ...

When it comes to electronics, it seems like a relay is such a simple device – yet, it is able to interface some pretty elaborate high-end systems with a fire alarm system. Working with relays is an ...

The circuit was designed to create an early warning alarm system against any form of theft that is significant to the owners of motorcycles or bikes. Mercury Switch – a switch constructed into a ...