HORN USING PHOTO-INTERRUPTER

摘要

PURPOSE: A horn is provided to remove electromagnetic noises by switching a current flowing in a coil without contact after removing a spark using a photo-interrupter. CONSTITUTION: A light shielding plate secludes a lighting emitting element and a light receiving element so that light from the emitting element reaches the receiving element. A switching circuit(Q1) selectively supplies a current to a coil. A photo-interrupter includes a light emitting element and a light receiving element. The photo-interrupter turns on the switching circuit when the light from the emitting element reaches the receiving element. The photo-interrupter turns off the switch when the light from the emitting element is shielded by the light shielding plate.