I am driving a ultrasonic transducer with a PIC does anyone know of a good circuit which will help to provide a bigger signal out of the transducer.

 

This is the third different forum you've posted in asking about the same problem! - you should stick in the same forum, the correct one for this would be the Micro Controllers forum, or perhaps Robotics?.

How large a voltage swing are you wanting?, and what are you trying to do with it?.

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