The crystal radio is a time-honored build that sadly doesn’t get much traction anymore. Once a rite of passage for electronics hobbyists, the classic coil-on-an-oatmeal-carton and cat’s ...

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 ...

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 ...