An ordinary automatic room power control circuit has only one light sensor. So when a person enters the room it gets one pulse and the lights come ‘on.’ When the person goes out it gets another pulse ...

Hotel rooms are often furnished with an interior key-holder near the main door which enables the ac power supply to everything in the room only when the key/keycard is hanged/inserted. The circuit ...

Are you dreaming of a crystal chandelier? This plug-in swag-style chandelier has all the bling you need in a chandelier to ...