Two-system radios, power-free crystal radios and IC radios use batteries. Here what is more highlighted is the large Capacitor Variable so that the impression is elite, haunted and rare.

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Card Crystal Radio

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I named the radio crystal card because it uses the body of the card.  For a scheme that uses a 456 crystal resonator maybe the first in the world because I myself have never found a crystal radio scheme that uses a 456 filter and I made it.
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