Re: [CAD_CAM_EDM_DRO] Transformer

In a message dated 14-Sep-00 20:28:34 Central Daylight Time, Ozzie@...
writes:

<< Can I use a stepup (115v to 220v)transformer in reverse and apply
115v to the output and get approx 55v output? >>
Jerry: Yes and no. A transformer is "normally" designed to handle about a
5% drop due to losses in the iron and copper. That is, the windings-ratio on
the secondary will have about 5% more turns than if there were NO losses
("ideal" situation, which "real-life" does not include!). But, you can
always put in LESS voltage into a transformer than the "input winding" is
designed for, that is, yes, you could put in 115 to the 220 V winding. But
you wouldn't get "exactly" 55 volts out. Maybe more than that,
"open-circuit" (load is ONLY voltmeter), and LESS than that, if you draw
current. BUT... Be careful, there! You must NEVER attempt to draw more
current out of a winding than it was designed to handle (in or out). Because
the "current load" determines the wire-diameter used to make the winding, and
attempting to draw more than it was designed for will overheat the winding,
probably "whole transformer", and "cook things"! And, when that "sudden
short" suddenly finally happens, SMOKE, and probably fire, and, is your
insurance paid-up???

See my article, "Roll your own..." It may have some info. which will amuse...

<A HREF="http://members.tripod.com/~schematics/xform/xformer1.htm">Roll Your
Own Power-Transformers!</A>

Careful! Jan Rowland, Troll