Re: Stepper Drivers

> McMaster Carr has multi-tap stepdown transformers. While intended
> for converting 240-480 to 120-240, they would work fine converting 120 to
> 60. Some derating may be necessary. 1.5KVA is about $150.

Thought of that. Friend of mine in the electric motor business suggested against it, but I may do it anyway.

> You could look for distribution transformers in a scrapyard. These
> are basically the same thing as above but mounted in a steel enclosure.
> Just make sure you don't get an autotransformer (only one winding) if you
> want an isolated supply.

Or an old one full of oil...

I had an old microwave transformer when in college (we made a heck of
a color organ lightshow with the SCR from it) but tossed it when I
graduated. Keeping my eyes out for another to salvage and rewind (I
think modern ovens may be switching? they seem lighter).

Sometimes it gets tempting to just buy IRF640's rated for 200 volts
and simply rectify the line...

Chris

--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
30 Griswold Street, Cambridge, MA 02138
http://www.mdc.net/~stratton
(617) 492-3358 home/shop