>Does anyone have an alternative suggestion?  Note, that I need to be able
to >'turn off' the circuit so there is zero volts across the transducer
>(apparently, a DC voltage across it causes 'wear and tear').  Both the
>transistor H-bridge and comparator circuits allow this by setting the CMOS
>signals to the same state.

Check out the Intersil HIP4080A H Bridge driver circuit. Intersil also make
suitable FET power transistors that will do this.

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