> My first thought is "will +/-24V be enough"? If so, can you run the
> piezo in bridge mode

There's an example of that (Fig 73, p24) in the OPA454 datasheet

"Bridge Circuit Doubles Voltage for Exciting Piezo Crystals"

http://focus.ti.com/docs/prod/folders/print/opa454.html

> If not, and you really need +/-30V supply, can you wind your own
> magnetics? If so, and it doesn't need to be very efficient, a two
> transistor astable multivibrator type of upconverter would be pretty
> easy.

Most switchmode controllers have application notes for boosting DC
to higher positive and negative supplies

eg the cheap old MC34063

www.onsemi.com/pub_link/Collateral/AN920-D.PDF

Fig 26, step-up  Figs 33/34, inverting

There are plenty of others, some quite efficient if that's important

Basically any oscillator can be used to switch an inductor in and out

Joe
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