On Sat,8/13/2016 8:11 AM, Jim Durham wrote:
I am using a Variac, which does the same thing and also allows me to
adjust the input AC voltage.
What it does that is the same is that it adjusts the primary voltage.
But it is VERY different from a boost/buck transformer, because it must
be rated for the full VA of the load.
A boost/buck transformer requires that the primary be rated for the line
voltage, but a much smaller current. Only the secondary must be rated
for the full load current. The result is that a good boost/buck
transformer is a much smaller and lower cost solution. All of them that
I have seen are multi-tapped and are clearly marked with voltage and
current ratings and their turns ratios, so it's almost trivially easy
to choose one and hook it up.
73, Jim K9YC
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