A crystal radio is basically a high Q resonator tied to an antenna and an envelope detector. These days the envelope detector is a point contact diode such as a 1N34 Germanium diode. The resonant ...

A crystal radio is often a kid’s first introduction to building something electronic. [Billy Cheung] is a crystal radio builder who wants to “make crystal radios as easy to use as regular ...

The National Association of Broadcasters (NAB), the commercial broadcasting industry’s trade association, announced ten ...

This wooden box receiver was bought over 20 years by an amateur radio collector. It contains spare wireless crystals and a cat's whisker. It's an example of early radio development.