[Milsurplus] LV Supply...

[Peter Gottlieb]

There is no real difference between using a bucking transformer vs a Variac, 
except of course the bucking transformer is fixed.  Feeding the primary with 
less than full voltage will not pose any problems whatsoever.

As for the windings question, it's not going to be a problem either way.  I mean 
if you're talking theory, you can start figuring magnetizing currents, core 
losses, copper losses, and all that but for all practical purposes that stuff 
can just be ignored.  If your buck transformer can handle the load without 
overheating, you are good to go.

Peter



Rick Brashear wrote:
> Thanks to everyone who helped with my low voltage supply dilemma.  I 
> tried the bucking transformer idea and it worked great, I should have 
> remembered to try that, but old age is creeping in and brain power is 
> creep out.  I don't have a transformer with a high enough amperage 
> rating to leave in circuit, but I'll get one.  Peter, since you were the 
> first to suggest that let me ask you.  Is there any difference in using 
> the "bucking" system to reduce primary voltage than there is using a 
> variac?  And, do you think feeding the primary with less than its 
> designed voltage will have any adverse affects?   My personal thoughts 
> are the bucking transformer is more like adding primary windings to the 
> original transformer, but I could be looking at it wrong.
> 
> I appreciate each and every suggestion, they were all certainly a 
> solution.  I do have a couple of variacs that would work, however, they 
> are both quite large and would be difficult to incorporate.
> 
> Thanks again to everyone for your help.
> 
> Rick
> 
> 
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