Re: Lowering Gecko Voltage

Gary,

That changes everything. I was laboring under the misconception you
needed to have a power output of +/- 10V. Now I understand what you
are looking for.

The equivalent of what you need (PID error voltage), exists as a 0 to
+5 voltage in the G320. This is the input to our pulse-width
modulator. It should be no big deal to take this voltage, offset it
by -2.5V and amplify it by 4 to get your +/- 10V control signal. A
single op-amp can do that.

If you are not averse picking this signal off of an internal surface
mount component to your circuitry, I can probably find a G320 with a
fried power section (thoughtfully provided to me by someone else),
that I can let you have for free if you send a stamped, self-
addressed dealie I can drop it in. You know the size of the drive so
make it appropriate.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "garyswindell" <gds@m...> wrote:
> The actual voltage to the piezo is around 500V the controller board
> needs the 10V input and it takes care of stepping it up.
>
> --- In CAD_CAM_EDM_DRO@y..., "studleylee" <indigo_red@q...> wrote:
> > I agree op amps( with beefed output stages) would do better for
> > precise positioning with piezos, but now he's got to design the
amp.
> >
> > Also what piezo motor only needs +/- 10 volts. Is this going
direct
> > to the 'crystal' or is there a drive involved that is contolled
by
> > the +/-10v that you wish to produce from a Step.Dir controller.
> >
> > Not an expert on piezo positioners, just tossing out ideas.
> > -Lee
> >