Re: [CAD_CAM_EDM_DRO] Power Supply Question

Yes, I know of the reactive metals one, but it is $400 for not much IMHO. I
was trying to just build a quick system to see if I needed to incorporate
this anodizing into my product line. I do not think there is a need to
regulate the current, but I haven't done any anodizing yet.

Thanks for the input.

Daniel J. Statman, Statman Designs
www.statmandesigns.com

----- Original Message -----
From: "jesse" <jkbrennan@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, October 31, 2001 5:55 PM
Subject: Re: [CAD_CAM_EDM_DRO] Power Supply Question


> I know you know this but see:
>
> http://www.reactivemetals.com/
>
> Their standard unit will be pretty simple I think it is a 225 watt variac
, a
> switch, a fuse ,\a full wave bridge and a recipticle out in a box. It may
have
> a capacitor for filtering and probably does. Components are
inexpensive. The
> Variac is about $75 at list . I bought a few of these industrial surplus
new
> for &20 each a while back but they are gone.
> Bill Sealy had plans for thes at one time but I think he will only sell
the
> units now. He does have a current control as an extra but I haven't been
able
> to find out what it actually is. The add on is cheap so it can't be much.
As I
> say I wasan't able to find a regulator IC that will work on 3 amps at 200
volts
> DC.
> I built my own box but still have no current regulation other than the
load.
> Jesse
> JanRwl@... wrote:
>
> > For that kind of "non-electronic" application, the rectified output of a
> > Variac (S.E.'s name for "variable transformer") would do. Oh, if you
need
> > more voltage, you could feed the output of the Variac into the primary
of a
> > 2:3 transformer, even an auto-transformer, and rectify the output of
that.
> >
> > For less than, say, 40 VDC, "precision" voltage-regulation is routine,
using
> > such as the 78HGA adjustable, 4-pin TO-3 regulator (Fairchild
Semiconductor).
> >
> >
> > But a relatively-precision (i.e., "electronic") 3-amp DC
adjustable/regulated
> > supply, up to 200 VDC? We're talking some serious change!
> >
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