I want to make a 1MHz ultrasonic generator with output in pulse or continuous form as well as high intensity. I got one circuit board of a scrap physiotherapy equipment. It basically consists of a 2 BU508 transistor and triac circuit to control power.
closed as not a real question by Anindo Ghosh, rawbrawb, Brian Carlton, Nick Alexeev, zebonaut Jan 23 at 21:24
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the BU508 is a low (6~30)current gain 700V NPN power transistor that is great for high voltage oscillators. Piezo devices have a maximum power dissipation spec so find out what it is.
Some relevant information may be found in this answer.
The frequency is much lower than 1 MHz, but since you're talking about physiotherapy equipment, it may still fit your needs.