Re: [CAD_CAM_EDM_DRO] Power Supply Question

Check :
http://www.herbach.com/
This is where I got the variacs from . They also will have A hospital type
isolation transformer which I should have mentioned . Rest of the stuff from
Radio Shack. I don't believe the original unit from reactive metals had an
isolation transformer but the current offering does include a hospital grade
isolation transformer similar or identical to the one from H&R.
You don't need much curent for the anodizing 3 amps is more than enough.

Jesse

Dan Statman wrote:

> 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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