Use this refrigerator alarm circuit to prevent leaving the fridge door open by sending out an alarm signal every time the door is left open for some time.

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 ...

A single PSR-TRISAFE safety controller can monitor an entire safety circuit from emergency stops to safety doors in a machine or plant. The 67.5-mm controller monitors up to 20 safety input ...