[SOLVED] what kind of diodes do we need to use?

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It allows the transducer to swing beyond the supply voltage rails. And in case of a bidirectional transceiver, isolates the driver from receiver path.

The diode type obviously depends on the intended transducer current. The demoboard (see supertex.com) is e.g. using a BAV99.
 
I didn't know supertex had such a thing as demoboard. thank you for pointing it.
 

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