Patent ID: 6075714
Filing Date: 2000-06-13
Classification: H02M

Abstract:
A circuit for alternately driving first and second vibratory devices, said circuit comprising:a direct current power source for providing a voltage to said vibratory devices,first and second control switches coupled between said power source and said first and second vibratory devices, respectively,an oscillator for generating a pulse train for turning said control switches on and off synchronously with said oscillator so as to create an alternating current in the corresponding vibratory devices, andfirst and second OR gates, said first and second OR gates each having a first input coupled to receive said pulse train from said oscillator and each having a second input coupled to receive first and second signals of opposing polarity, respectively, said first and second signals indicating which of said first and second vibratory devices is selected for operation, and said first and second OR gates each having an output coupled to said first and second control switches, respectively,whereby one of said first and second control switches is turned on and off synchronously with said oscillator while the other remains off.