SparkFun’s latest tutorial shows you how to work with relays. A relay is an electrically operated switch. In this case, they’re using it to switch a 120V AC outlet. The article carries … ...

A small, axial-lead diode across the slave relay coil was all it took to get all 600 units to work properly. No redesign, scrapping, or disappointed customer, and minimal cost. As I prepared to report ...