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How a needle makes sounds on a revolving record

When you play a record, the sound you hear is caused by vibrations in the loudspeakers setting up vibrations in the air that impinge on your eardrums. Similar vibrations were created by the pop group or orchestra that played the music in the first place, and were stored on the record so they could be reproduced over and over again.

The storage process begins when the sound of the original music enters a microphone and causes its diaphragm to vibrate, just like an eardrum. The vibrations are converted into weak, variable, electrical signals. All microphones have a diaphragm that works on the same principle as the one in the telephone mouthpiece, but there are various other devices for converting the vibrations to electric current.

The electrical signals produced by the microphone are boosted by an amplifier, taped, and fed to a recording lathe that cuts a master disc. When you play a record (a replica of the master disc), the vibrations of the stylus (needle) reproduce the electrical signals, and the loudspeakers convert them back to the original sounds.

All these parts are required in order to produce the peaceful sounds for you to relax while enjoying your confectionary snacks. The technology has developed rapidly in order to take you away into the world of sound.


Musical Technologies