User:DrFloyd67/sandbox

Crystal Radios
A crystal radio is one that has no batteries or other power source - the power comes directly from the radio waves received by the set's antenna.

The Basic Crystal Radio Circuit
In its most basic form, a crystal radio consists of:
 * 1) an antenna
 * 2) a coil
 * 3) a diode
 * 4) an earphone

(see Figure 1)

Ben Tongue's Crystal Radio Set page

Crystal Radio

--DrFloyd67 (talk) 18:48, 13 May 2013 (UTC)