Vic,
> What I want to know is how much DC I can draw from the HV winding
> with a full-wave CT circuit.
A simple rule for small transformers is that they are designed to have a
voltage drop of close to 5% in each winding (10% total). This figure can
vary a little, but not very much. At least it gives a reasonably close
idea. So, take out your multimeter, measure the resistance of the
windings, and apply Ohm's Law, using 5% of each winding's voltage. That
will give you the approximate current rating of each winding.
It might be good to measure both the primary and secondary windings,
calculate the current for each, and see how well the two power ratings
match. They should be very close, of course. If there is a large
difference, you either have made a mistake, or the transformer is poorly
designed!
Note that this 5% voltage drop per winding is typical only for medium
size transformers. Very small ones, like those in wall warts, tend to
run with higher voltage drop, 10% or even more per winding, while large
transformers run with ever smaller voltage drops, as size increases. The
truck-size jobs at the town's substation certainly drop less than 1% per
winding!
Manfred
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