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Disciplines

Electrical and Electronics

Publication Date

2022

Document Type

Article

DOI

10.25778/02sa-rn44

Abstract

The goal of the research presented in this paper is to examine the techniques used for the construction of early radios, specifically crystal radios. The paper begins with a brief summary of the history that led to the transition from wired to wireless communication. Next, the paper examines the components used in building a crystal radio including basic antenna design and the resonant circuit, and it also takes a close look at the point-contact rectifier, which was a catalyst in the use of radio waves for communications and allowed for even the most inexperienced person to construct their own home radio system. The paper includes a detailed description of the construction of the crystal radio including the winding of a custom-made inductor and shows the construction of a point contact for a galena crystal to act as an AC rectifier.

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