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? Did you hook the antenna to the bedsprings and listen under the covers late at night to try to pick up some exotic distant station? Neat-o.

If you build a crystal radio without a long antenna and good ground, it’s not so much a crystal radio as soldering practice. Report comment. Reply. Miroslav says: September 17, 2016 at 7:50 am ...

A crystal radio set is almost like magic. Sound appears, seemingly out of nowhere, powered not by cords and batteries, but by the very air around you. “You can’t quite work out how it comes ...

Dennis enjoys sharing the crystal radio receiver with young people today. When the York County History Center holds Family Days at the Agricultural and Industrial Museum, he will bring in a ...

A prototype liquid crystal antenna may lead to faster-tracking, ... he has been able to selectively amplify radio signals coming from specific directions.

A crystal radio is the basic form of a radio, which can detect radio signals without a power supply. It has very few parts and it can be built in a short time with commonly available items.

A crystal radio which uses an umbrella for its antenna February 20, 1910 Washington Post Indeed, by 1922, the term “wireless telephone” as used in Eve’s Wireless was actually quite old ...