On Sat, 9 Jan 1999 12:02:24 -0400 Ricardo Ponte G <rniniver@CANTV.NET>
writes:

>        I have used only One primary to 115vac and connected in series
>the outpu=
>t
>to get the maximum voltage.
>

You really should connect both primaries (in parallel) to reduce
resistance losss in the primary.  If the load is less than half of the
transformer's rating though it won't be strictly necessary, though it
will run cooler if you do.  It is OK to connect the secondaries in series
or in parallel to get the voltage you want.  Reemeber that with the
secondaries in series, you have only half the current (but twice the
voltage) that would be developed with them in parallel.

Though you're not doing this, others should beware of using the two
primary windings or two secondary windings seperately to provide seperate
isolated voltage sources.  The breakdown voltage between sections of the
primary or secondary may not be very high.  Usually the transformer is
only rated for isolation between primary and secondary, as it has extra
layers of insulation there.


>        Is it normal that this device get so hot ????

Yes, a lot of small transformers run hot.  They are not designed for
efficiency because the absolute amount of power lost is rather small.  If
the transformer is not way too hot to touch it should be OK.

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