Back before cell phones … before video games … before television … even before electric radios, there were crystal radio receivers. In the early 1920s and 1930s, magazines offered instructions on how ...

Many years ago when I was about 10 years old I received the gift of a crystal radio. I think it had about three parts. What was the crystal and how did it work? A crystal radio? Did you hook the ...

If you are ready to take a break from high-speed, complex digital systems, consider becoming a “rock hound” and constructing a crystal radio, one of the earliest forms of receivers. For close to 100 ...

Marked: "Martian / Big Four / Newark, New Jersey / Pat. Pend.". A crystal radio detector with binding posts for headphone connections on top, posts for antenna and ground connections on bottom.

Marked: "Radiogem / The Radiogem / Corporation / New York". A kit to make a crystal radio receiver, including original package and instruction manual. Unit is a commercial variety of the old Quaker ...

A rite of passage in decades past for the electronics experimenter was the crystal radio. Using very few components and a long wire antenna, such a radio could pick up AM stations with no batteries ...

This article is intended to introduce the beginner to the interesting and challenging art of high frequency radio design. It is also intended to entice the seasoned professional to take a deeper look ...