It’s then a simple matter of hooking up the right pads on the credit card to the rest of a crystal radio circuit, and you’re all set. Of course, [Billy] goes the whole hog, building the entire ...

Get back to basics and make a crystal radio. Learn about resonant circuits, experience history, wind high Q inductors, make antennas, and experience the fundamentals of wireless design.

The National Association of Broadcasters (NAB), the commercial broadcasting industry’s trade association, announced ten winners of its Crystal Radio Awards on Tuesday. The Crystal Radio Awards ...