[Milsurplus] [BoatAnchors] 125 VAC Line? Make Your BA's Happy, Cheap.

[David Stinson]

-----Original Message-----
>From: Brian <brianclarke01 at optusnet.com.au>

>However, re your last paragraph: as soon as there is Voltage across the 
>primary, there is magnetizing current. So, no load is needed to measure the 
>'new' output. I would be interested to know where you picked up your 
>(un)factoid.

Practical experience.  Both of us measure voltages 
far off the mark if the device is drawing no current.
Once loaded, lightly or heavily, the voltage is
as expected.
i.e. Ronnie built one with a Rat Shack 12 VAC transformer.
His line voltage was 118 VAC.  With no load, the
output measured 114 VAC.  With the modest load of an
IFR service monitor, it displayed the expected 106 V.
I have similar experience with mine.  The size of the 
load seems to matter less than the fact there is one.

I surmised that since this was wired not like a
variac (as Mike was suggesting in his post) but as 
a "bucker," there would need to be some current in 
the windings to establish a significant out-of-phase
magnetic field to do the bucking, just like one must
have current through a resistance for it to drop voltage.
My assumptions might by flawed, but the effect is real.

73 DE Dave AB5S