With the source taken care of [Glitch] uses an optoisolator for both protection and level conversion. After working the bugs out of the design he was able to control the relay using 3.3V, 5V, or 12V.

Dominic DeAngelo, Braydon Caraballo, Nate Baker and Nathaniel Lambert took the gold at Indoor Track and Field States ...

In 1956, Fujitsu decided to compete with IBM and built a relay-based computer ... it may be the oldest working computer. The relays in the computer were adapted from telephone switch networks.