From: Mike Rosing <rosing@neurophys.wisc.edu>
Newsgroups: sci.physics.plasma
Subject: Re: PSU needed can you help??
Organization: University of Wisconsin, Madison
References: <b9p9mh$aema$1@saturn.cs.uml.edu>


Sonicguru wrote:
> Greetings Again everyone
>
> sorry to post this unrelated laser question just thought maybe one of
> you electron focused brainiac's (-; might be able to shed some light
> on this for me!
>
> problem:
>
> Working on a rather cool full wave electro-acoustic resonator and need
> to drive a rather large piezo stack with 600-800v at 5.6khz-23.7khz
> adjustable sine wave output...
>
> current will be somwhere between 125ma-250ma depending on the quantity
> of wafers I end up with in the stack and it needs to be quite linear
> in output.
>
> Any Idea's poping into your head at the moment?
>
> No audio application amps will swing bigger than 110-125v in bridge
> mode typically and I can't for the life of me think of a transformer
> type that will be anywhere close to the step (8 or 9 to 1) I need and
> yet capable of efficient inductance at that freq.
>
> most audio related big transformers work very poor above 15khz and
> really are quite useless at 18khz+
>
> Do any of you know of a cascaded output section amplifier topology
> capable of swinging this kind of amplitude at freq?
>
> Many thanks for anyone with ventured knowledge or just thoughts...

Here's something that might be stackable. Put 4 of them in a series/
parallel combination to get the voltage and current you want.

http://www.mskennedy.com/pdf/162-63rc.pdf

A web search on "high voltage op amp" might get more too.

Patience, persistence, truth,
Dr. mike

--
Mike Rosing
www.beastrider.com BeastRider, LLC
SHARC debug tools