= Crystal radio
{tag=Radio receiver}
This was the first generation of commercially successful radios.
It uses a <crystal detector> as its <diode>, which is a crucial element of the radio, thus its name.
They were superseded by <#transistor radios>, which were much more reliable, portable and could amplify the signal received.
\Image[https://upload.wikimedia.org/wikipedia/commons/3/3b/Kristallradio.JPG]
\Video[https://www.youtube.com/watch?v=0-PParSmwtE]
{title=How a <Crystal radio> Works by RimstarOrg}