the subject innovation is to provide a solid state horn existing cylinder behaves as compared to one-half the frequency by adjusting the duty ratio of current horn relates to a horn for automobiles. The oscillation frequency current to flow in the ; core coil in the horn sounding board to quiver resonance vibrations associated with the amateur spirit, ; to obtain the oscillation frequency IC chip timer sets the duty ratio of the oscillation frequency so that frequency to a maximum width of Resonance soul. ; The frequency and duty power amplifier non-magnetized iron core. By the magnetized iron core resonance vibration horn Shake plate is used as the horn sounds as an amateur. ; Thus, by adjusting the duty ratio of the frequency resonance so that the duty ratio of more than 110 db horn with minimal current will be one of the 110 db horn sounds clean and clear 2~2.5 amps. This can be used to make as a horn of the electric car. ; The current flowing style horn is a lot of existing contacts current consumption does sound more current consumption for use in electric vehicles to 5-6 amperes and it is the duty ratio of the resonant frequency horn to fine-tune the structure can not be malji there was a loss. To solve this problem is to be characterized by a crystal-clear sound horn. ; Horn, integrated circuits, I C, digital photo interrupter, contact switches, optical sensors,
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