Crystal radio

A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio wave to produce sound, needing no external power supply. It is named for its most important component, a crystal detector, originally made from a piece of crystalline mineral such as galena.

This component is now called a diode.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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