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 ...

Marked: "The Grewal Mfg. Co. / Newark, N.J. / Pat. Pend." A crystal detector with induction coil and slider. Detector is fixed type, and has one lead to a .0005 mfd. bypass capacitor which offers a ...

A staple of starting off in electronics ion years past was the crystal set radio, an extremely simple AM radio receiver with little more than a tuned circuit and a point contact diode as its ...

In the design of radio receivers for the measurement of certain types of amplitude-modulated transmission, a useful increase in the output signal/noise ratio can be achieved by restricting the ...