January 20th, 2012
Some of the types of loudspeaker
Piezoelectric speakers are commonly found in watches used as beepers. They produce single high frequency sound.Electrostatic Loudspeakers produce sound by using high voltage electric field to drive a thin membrane between two perforated conductive plates called stators.Ribbon speakers, just as the name suggests, consist a thin metal film ribbon suspended in a magnetic field. When electrical signal is applied to the ribbon it produces the sound.Planar magnetic loudspeakers have flat roughly rectangular shaped radiating surfaces, with a flexible membrane and a voice coil printed or mounted on them. The current flowing through the coil interacts with the magnetic field of carefully placed magnets on either side of the diaphragm. This causes the membrane to vibrate more or less uniformly and without much bending or wrinkling.
