Caution:
All this is true except You MUST properly phase the
windings you connect in series or parallel.  if you fail to
do this properly the fields will be bucking each other,
the output low and the transformer will get quite hot.

-Dan   W6DFW

At 09:47 AM 1/10/99 -0500, you wrote:
>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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73,
Dan Welch
w6dfw@qsl.net