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Ultrasonic atomizer circuit having plural oscillators

  • US 4,996,502 A
  • Filed: 09/29/1989
  • Issued: 02/26/1991
  • Est. Priority Date: 10/01/1988
  • Status: Expired due to Term
First Claim
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1. An ultrasonic atomizer circuit comprising a plurality of unit oscillation circuits each coupled commonly with a secondary winding of a single common transformer (PT) through a rectifier circuit (DS),each of said unit oscillator circuit comprising a transistor (Q1) with a grounded collector, a piezo-electric vibration element (TD) coupled across said collector and a base of said transistor, a capacitor C1 coupled across an emitter and said collector of said transistor (Q1), and a capacitor (C3) coupled across said base and said emitter of said transistor (Q1),wherein the improvement comprises another capacitor (C7) coupled between a junction point of one end of said vibration element (TD) and one end of said capacitor (C3), and the base of said transistor (Q1), so that said capacitor (C3) is separated from said base circuit of the transistor (Q1) for DC current.

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