It beeps if the fridge door is left open for too long or hasn’t closed properly, to stop food from spoiling. There are lots of other uses as well. A refrigerator or freezer door that is left open or ...

Accurate tower light monitoring is a serious matter, and great care can be taken to install a thorough and automatic monitoring system. Designing a system to provide a single-lamp failure can quickly ...

Environmental systems that precipitate dust and carbon particles frequently use high-voltage dc power supplies. However, failure of high-voltage components caused by a change in their properties over ...

Electronics-loving orthodontic clinician Dr. Mark Brickley has developed a collection of electronic circuit-building experiments, tested them on unsuspecting colleagues, and then squeezed them into a ...