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 ...

The AM broadcast band doesn’t have a lot of mainstream programming on it across much of the United States today. That’s a shame because a lot of kids got their first taste of radio and electronics by ...

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.

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.

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 ...

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 ...

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 ...

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