Auto electric horn is to rely on the Multimedia Speaker of the metal diaphragm to sound. Automobile electric horn by core, magnetic coil, contact, armature, diaphragm, etc. When the driver presses the horn switch, electricity flows through the contact through the coil, a coil magnetic suction under the armature, mandatory move diaphragm, armature move off contact, interrupt current, coil magnetic disappeared, diaphragm armature on bookshelf speaker own flexibility and spring leaf restored with in situ, contact closure reclosing circuit, current pass through magnetic coil, contact the repeat the action. So circular diaphragm vibration unceasingly, thus two sound. Soundboard and diaphragm rigid connection, can make the vibration smooth sounds more pleasing to the ear (namely electromagnet principle).
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