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(2001). ISBN1-60680-119-8. Crystal radios have been improvised using detectors made from rusty nails, corroded pennies, and many other common objects. Sometimes efforts to recover this power are confused with other efforts to produce a more efficient detection. This history continues now with designs as elaborate as "inverted two-wave switching power unit".:129. ISBN1-4208-9084-0. Retrieved 2010-01-18. This led determined listeners to build their own "clandestine receivers" which frequently amounted to little more than a basic crystal set. 102-104 ^ Radio Communication Pamphlet No. US: McGraw-Hill Professional.
^ Sarkar, Tapan K. Advertisement. ISBN0852967926. Kenneth Kuhn website, Univ. 755,840 (filed: September 30, 1901; issued: March 29, 1904). In some circuits a capacitor is not used, as the antenna also serves as the capacitor. They also sell a bunch of very cheap but effective starter kits, like this one, the XS500 Basic Crystal Radio Kit, selling for $15. 144 ^ a b c Binns, Jack (November 1922).
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