This radio's transistor is powered with the signal's own energy, producing its amplification. Preference should be given to an old Germanium transistor NPN, as it is more sensitive. L1 consists of 80 turns of wire 28 in a ferrite rod, the antenna must be very long, and the variable capacitor can be used from an unused radio. Earthing is important to achieve the best performance. The circuit is from the book Fun Projects for the Experimenter by Newton C. Braga, published in the United States.
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