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Ultrasonic transducer driver amplifier circuit replacement. 40Khz Ultrasound Transducer Driver uses Medium Power - This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal... Hobby Circuit designed by David Johnson P.E.-January, 2006. A Cheap Ultrasonic Range Finder - Do you need to add a distance sensor to your embedded project? Build this simple ultrasonic. When connect ultrasonic transducer amplifiers in parallel, a small resistor in series is needed to isolated the driver amps from one other. It is recommended to use 0.3Ω to 1.0Ω series resistance. Use larger resistance for higher output voltage. I am looking for a circuit diagram for a high power ultrasonic amplifier.Needs to drive an underwater transducer rated at 50 watts.Currently using a single HexFet driving a 1:25 toroid to 1000vpp, but I need to increase the duty cycle past 1% for more output power.