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Laptop Battery Shop » Crystal radio 5 Mar 2011, 2:11 am
The wire antennas used with crystal receivers are monopole antennas which develop their output voltage with respect to ground. They require a return circuit connected to ground (earth) so that the current from the antenna, .... Crystal radios have also been made with rectifying junctions improvised from a variety of common objects, such as blue steel razor blades and lead pencils,rusty needles, and pennies In these, a semiconducting layer of oxide or sulfide on the metal ...
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