[Alexandria Radio Club Reflector] Crystal radio, using a penny

[Edward Bradshaw]

There is a fantastic video series on YouTube called Sixty Symbols, by
filmmaker Brady Haran, which does a great job explaining the principles of
physics.  In the latest video, Prof. Moriarty builds a crystal radio and
uses a copper penny as the semi-conductor.

https://www.youtube.com/watch?v=bUMXc6fi7yk

73,

Ed, W4EDF