Did you ever build a crystal radio receiver?
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Crystal detector - Wikipedia
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Ericsson Crystal radio set type 0/1002 with cat's whisker circa 1922 to 1924 BBC Type Approved by Postmaster General JMH4912 Stock Photo - Alamy
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Crystal Radio Sets & Cat's Whisker History » Electronics Notes
Crystal Detector: Cat's Whisker Radio Detector » Electronics Notes
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Crystal radio - Wikipedia
Crystal Detector: Cat's Whisker Radio Detector » Electronics Notes
