I am planning to use this 40kHz 60W ultrasonic transducer in a project. I understand that it needs to be driven at its resonant frequency, but I am not sure what kind of circuit or driver is best suited for it. Could you please suggest how I can properly drive this transducer and if there are any recommended circuits or modules that I should look into? So far I have tried driving it with a square wave but it generated a lot of harmonics.