!["Coupling" 1976 [Gum-bichromate]](http://2.bp.blogspot.com/_IoU3bEFUwWc/S69lnr9G6AI/AAAAAAAAH58/O40Gg-G6rKk/S150/COUPLING+3.jpg)
Have you ever tripped the electromagnetic spectrum...used a crystal radio set?
Yes...1
No...2
Quite surprised. Crystal radios are cool, inexpensive, and easy to construct. There is still time to enjoy them.
Crystal radio sets
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