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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