"Matthew Rossiter" wrote in message
...
What if you used a secondary transformer with a Center Tap and used the
VARIAC to control the AC input? I guess that's a pretty simple question,
but just want to make sure I'm not missing something.


Yes, that would work. You would need to find a transformer with a 50v - 0 -
50v secondary ( or two 0 - 50v windings that you could hook in series ) that
could supply the current demand of the monitors that you want to power.
Then, as you say, you would connect the variac to the primary. This scheme
will have the added advantage that it will provide safety isolation that the
variac on its own, won't.

If you couldn't find such a transformer, you could use two single-secondary
transformers, with the secondaries hooked up in series, and the primaries in
parallel, to arrive at the same end result.

Arfa