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 ...

One of the graduate students, Seymour Benzer, accidentally discovered that a crystal of germanium -- a semiconductor which was not well understood at the time -- could withstand higher voltage ...

With nothing more complex than a germanium point-contact diode and an oscilloscope ... being shown is the very simplest incarnation of a crystal set. It’s a wideband device, with only the ...