Last week I revealed the sneaky physics behind the “joule thief,” an electrical circuit that lets you squeeze more energy out of seemingly dead batteries. The key, it turned out, was a clever pairing ...

What is a relay? What is zero voltage switching? How to create a zero-crossing relay driver with a simple external circuit. A relay is a device that allows for a smaller electronic switch to control a ...

I recently installed a new stereo head-unit in my car. One of the challenges with installing this head-unit was that a certain wire from the harness needed to be grounded, but only after the radio had ...

Electromechanical relays for testing products ranging from automotive engines to thermocouples are readily available, low-cost devices you can use to route signals originating from almost anywhere. It ...