The 1000V is just there to drive current into capacitive load. Caterpillar et factory passwords change keygen generator photoshop. What frequency (s?) are you wanting to use this kit at, because the cheapest bang for your bucks is to match the capacitive impedance out with a series inductor,likewise to resonate the connecting leads out with an inductor across the transducer itself. Do some experimenting with a low level signals to build a reasonable equivalent circuit of your transducer, then a matching circuit. To deliver a lot of power it is convenient for the matched impedance to be in the order of 10-100 ohms. Beyond these limits you have to either generate excessive voltage or current.
A piezo transducer behaves somewhat as a capacitor. As your driver transistor allows only a single polarity intermittent current to flow in the transducer (with or without D1) there is no oscillation as would be required for an ultrasonic output. The transducer's capacitance simply charges up to about the supply voltage.