I've been doing a lot of relay-based projects lately; building several light timer projects. The first couple used Arduino-class devices, simple relays and provided the ability to set multiple on and ...

In this circuit the 555 timer is used in a novel way, as a voltage controlled switch.The old and omnipresent NE555 can be very good at something it was not meant for: driving relays or other loads up ...

This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example, we commonly see use of infrared proximity sensors ...