Article of manufacture and apparatus for producing ultrasonic power

Claim 1

A CIRCUIT FOR PRODUCING ULTRASONIC VIBRATIONS WHEN A SUITABLE VOLTAGE SOURCE IS CONNECTED BETWEEN THE INPUT TERMINALS THEREOF, SAID CIRCUIT COMPRISING: A MAGNETOSTRICTIVE CORE; A SUBSTANTIALLY UNIFORMLY THICK EPOXY-RESIN COATING .020 TO .050 INCH THICK SHRUNK OVER SAID CORE WHICH EXERTS A COMPRESSIVE FORCE ON THE CORE; FIRST AND SECOND CENTER-TAPPED WINDINGS RESPECTIVELY CONSTITUTING PRIMARY AND SECONDARY WINDINGS WOUND ON SAID CORE OVER THE CURED EPOXY-RESIN COATING, THE CENTER-TAP OF SAID PRIMARY WINDING BEING CONNECTED TO ONE OF THE INPUT TERMINALS; A PAIR OF TRANSISTORS, EACH OF THEM HAVING FIRST, SECOND AND THIRD ELEMENTS, SAID FIRST ELEMENTS BEING CONNECTED TO THE OTHER OF THE INPUT TERMINALS, SAID SECOND ELEMENTS RESPECTIVELY BEING CONNECTED TO ENDS OF SAID SECONDARY WINDING, AND SAID THIRD ELEMENTS RESPECTIVELY BEING CONNECTED TO THE ENDS OF SAID PRIMARY WINDING; MEANS COUPLED TO THE CENTER-TAP OF SAID SECONDARY WINDING FOR APPLYING A SUBSTANTIALLY EQUAL VOLTAGE BIAS TO SAID TRANSISTORS; AND A CAPACITOR CONNECTED BETWEEN THE ENDS OF SAID SECONDARY WINDING, THE CAPACITANCE OF SAID CAPACITOR BEING OF SUCH VALUE THAT SAID CAPACITOR WILL RESONATE WITH SAID SECONDARY WINDING AT SUSBTANTIALLY THE FREQUENCY OF VIBRATION OF SAID MAGNETOSTRICTIVE TRANSDUCER.