Perhaps the simplest radio one can build is the crystal radio. Using a diode as a detector, the design generally uses less than 10 components and no battery, getting its power to run from the radio… ...

If you make crystal radios, you’ve probably got a few crystal earpieces. The name similarity is a bit coincidental. The crystal in a crystal radio was a rectifier (most often, these days, a ...

Dennis enjoys sharing the crystal radio receiver with young people today. When the York County History Center holds Family Days at the Agricultural and Industrial Museum, he will bring in a ...

A crystal radio set is almost like magic. Sound appears, seemingly out of nowhere, powered not by cords and batteries, but by the very air around you. “You can’t quite work out how it comes ...

A crystal radio is a passive receiver. That means it takes its power from the radio signal itself and not from some external source, such as a battery or wall outlet.

Crystal Radios are an old standby of GeekDads. For the early mists of time Geekdads have been showing kids how to pull radio stations from thin air with the barest snips from the basement. Here ...