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Chapter 4: Radio -- Build a crystal radio set in 10 minutes
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Crystal radio - Wikipedia
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Crystal radio - Wikipedia
Carolina Am Crystal Radio Kit, Contains Materials To Build 10 Crystal Radios - Walmart.com
How a Crystal Radio Set Works - YouTube
Did you ever build a crystal radio receiver?
Multiband Crystal Radio Set Pulls Out All The Stops | Hackaday
Crystal radio - Wikipedia
Crystal Radio Kit 3 - Mike's Electronic Parts
