High intensity ultrasonic generator

An ultrasonic vibration generator comprising:

• a variable frequency oscillator means for producing an oscillating signal at a variable ultrasonic frequency, responsive to a varying frequency control input signal to the variable frequency oscillator;
• frequency control input signal means for providing the varying frequency control input signal to the variable frequency oscillator means;
• speaker means, responsive to the output of the variable frequency oscillator means, for producing mechanical vibrations;
• the speaker means including a multimorph piezo-ceramic wafer transducer, a speaker casing and a speaker cone, free floating within said casing and mechanically connected on one surface of the wafer, the speaker cone not being held in place within said said casing by other than the mechanical connection to the transducer, and the opposite side of the wafer having no coating of dampening material;
• and
• amplifier means for amplifying the output of the variable frequency oscillator and providing the amplified output of the variable frequency oscillator to the speaker means, said amplifier means including a VMOS field effect transistor having a drain;
• a choke;
• a capacitor, said choke and capacitor each having a first terminal connected to the drain of said field effect transistor;
• and an inductive load in parallel with the speaker means, the parallel combination of said inductive load and speaker means being connected to a second terminal of said capacitor;
• the inductive load and the speaker means having respective inductive and capacitive values which provide resonance between the inductive load and the speaker means at a selected output frequency of the variable frequency oscillator means.