[R-390] Bucking Transformer / Autotransformer Question

[Barry]

Yes, that's the traditional method.  From what I've read, an autotransformer configuration is supposed to be slightly more effecient so am looking at trying that.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Roy Morgan" <k1lky68 at gmail.com>
> To: "Barry" <n4buq at knology.net>, "r-390" <r-390 at mailman.qth.net>
> Sent: Wednesday, July 15, 2020 5:45:10 PM
> Subject: Re: [R-390] Bucking Transformer / Autotransformer Question
> 
> Find the r-390 website and look for the "Hivolts" article.
> 
> Briefly you ave all that's needed and are worrying about something that's not
> a problem.
> 
> Roy Morgan
> K1LKY Western Mass
> 
> > On Jul 15, 2020, at 3:03 PM, Barry <n4buq at knology.net> wrote:
> > 
> > I'd like to employ a bucking transformer for some of my equipment -
> > particularly a Fluke 760A calibrator.  I have a pretty hefty old
> > transformer with two, separate 10V secondaries that can deliver 1.0A and
> > 10.0A.  It also has a tapped primary with taps at 115V, 120V, 126V, and
> > 132V (I think I'm remembering all those correctly).
> > 
> > I was thinking that since my mains voltage is right around 126V, then I
> > could connect that to the mains and use the 115V tap in an autotransformer
> > configuration.  I'm unsure, though, whether that is the best way to do
> > this and whether the primary windings will have to carry more current than
> > it's capable of supplying.
> > 
> > While I could connect one of the secondaries as a standard bucking
> > configuration, I was thinking the autotransformer configuration might be
> > better/simpler.
> > 
> > Any thoughts on this approach?  I'm just unsure of how much current that
> > small section of primary would need to supply.  I think it would be the
> > total current drawn by the load but I might be thinking of that
> > incorrectly so thought I'd ask.
> > 
> > Thanks,
> > Barry - N4BUQ
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