crystal set的意思|示意

Crystals sets are an ancient form of radio receiver and radios that work with no external power source. It was first introduced in 1907 and was widely used in the early part of the 20th century. It was the first type of radio receiver that allowed people to listen to radio broadcasts without having to purchase any expensive equipment or power.

A crystal set consists of only a few simple components: an antenna, an earpiece, a tuning capacitor, a diode and a crystal. The antenna captures radio waves, sending them to the earpiece which converts the radio waves into sound. The tuning capacitor is then used to adjust the frequency of the waves that can be picked up by the crystal. The diode is needed to rectify the waves, and the crystal actually does the work of amplifying the radio waves.

To use a crystal set, one must tune in a radio station by adjusting the tuning capacitor. Then the diode can be adjusted to focus on a single radio station, increasing the sound. To adjust the volume, one needs to open and close the earpiece.

In modern times, crystal sets are used purely for nostalgic reasons and because of the simplicity of their design. They can often be found in museum exhibits or in antique stores around the world.