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 ...

Built in 1938 by Edwin Howard Armstrong, the 425-foot structure remains one of the tallest landmarks in Bergen County.

No nameplate or maker's marking. A fixed inductance coil with sliding control and crystal detector. Inductance of the tuning coil is varied by a slider. Binding posts on wooden base. A .0003 mfd.

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.

The possibility of producing FM crystal radio is shown in this project which can produce a sound with high fidelity that is as good as or better than more expensive AM radios when connected as a ...

Of all the horrors visited upon a warrior, being captured by the enemy might count as the worst. With death in combat, the suffering is over, but with internment in a POW camp, untold agonies may ...

Did you know you can build your very own working 3D-printed radio — without any soldering, electronics experience, electric cord, or even batteries? That’s exactly what talented Houston, Texas-based ...