The Basic Crystal Radio is just this much:
A coil, Variable capacitor to tune frequency, a crystal Diode and a High Impedance headphone, makes a crystal radio. You require a very good antenna and good ground. The .001 capacitor is to remove radio frequency from signal & get audio only for phones.
|In this project, I am using above circuit already, for those interested only up to this level. So that a crystal Radio remains a crystal radio in its original form. You have an option to use High Impedance earphone and listen this radio without power.|
Crystal Radio Document