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.

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 ...

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 ...

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 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 ...

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.

The Gecophone Crystal Set No 1 is a simple variometer turned crystal receiver and has connection points for the aerial, earth and headphones. Work Type. Radio Communication. Date. 1923. Description.