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 ...

Most crystal radio receivers have a decidedly “field ... chunky knobs and homebrew rotary switches for band selection and antenna. As nice as the details on the electronics are, it’s the ...

The earliest and cheapest radio set for the home was the crystal set. The essential components were a fragile fine wire (the 'cat's whisker') acting as an aerial connected to a small piece of ...