How a Crystal Radio Set Works

Discover how a crystal set radio works and some of the hints and tips in building them.

Crystal radios were used in the early days of radio broadcasting. They used crystal detectors that were known as Cat’s Whiskers because of the thin wire that was placed onto the crystal itself. These radios required no batteries, all the power for the earphones coming from the signal that was received.

This video describes how the tuning and selectivity of the crystal radio works. It shows how the tuning capacitor and inductor may be changed to tune in different stations. It then describes the detection of amplitude modulated signals. It shows how a diode detector works. Finally it mentions the transducer and why only headphones are normally suitable for use with crystal radio sets.

The basic principles used within crystal radio sets are also employed in other more sophisticated radios, but this demonstrates how the basic radio principles work.

The video then provides some useful practical hints and tips about building and using crystal radio sets.
More information can be found on our crystal radio pages: https://www.electronics-notes.com/articles/radio/radio-receivers/how-does-crystal-radio-work.php

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Видео How a Crystal Radio Set Works канала ElectronicsNotes