ELI5: Explain Like I'm 5

Plate detector (radio)

A plate detector is a device used in radios to detect and amplify radio signals. It works by using a special metal plate that can capture and convert radio waves into an electrical signal that the radio can use.

Think of the plate detector like a catcher's mitt in baseball. When someone throws a ball (in this case, radio waves), the mitt (plate detector) catches it and allows the player (radio) to catch the ball (signal) and play the game (amplify and play the audio).

The metal plate is made of a special material that can absorb and "detect" radio signals. When a radio wave hits the plate, it generates an electrical signal that the radio can use as a source of power. This electrical signal is then amplified and played through the radio's speaker.

The plate detector is an important part of old radios, especially those made in the early 1900s. It was the main way that radios could pick up and amplify radio signals for people to listen to. Nowadays, digital radio technology has taken over, but plate detectors are still used in some vintage radios or radio restoration projects.