WTB: Tower case for IBM model 80, 60 or 65 (PS/2)

[Dwight K. Elvey]

Hi
 Another option on the auto transformer is to use
the primary of a transformer that was designed to
be configured for both voltages. You just ignore
the output leads. The transformer in this case only
needs to be rated for 1/2 the power that you are
sending to the final device. It should be noted that
in der Mouse's diagram, each transformer needs to
be rated for 1/2 the power.
Dwight

>From: "der Mouse" <mouse at rodents.montreal.qc.ca>
>
>> A crude method is to find three biggish AC power transformers all the
>> same.  Hook all three secondaries together in parallel, then use one
>> of the primaries as the primary and hook the other two secondaries
>> series-aiding to make the 220 volt 'secondary.'
>
>Just watch your phasing; get the leads swapped to one of the "other
>two" transformers and you'll get (nominal) zero voltage instead of
>double voltage.
>
>Indeed, you can do something autotransformerish with only two
>transformers:
>
>   ---------------------.
>IN                      |
>   --------+------------|-------------------------------
>           |            +----+                           OUT
>           |            |    |            +-------------
>           |            |    |            |
>           |_()()()()()_|    |_()()()()()_|
>            _==========_      _==========_
>           | ()()()()() |    | ()()()()() |
>           |            |    |            |
>           +------------|----+            |
>                        +-----------------+
>
>Of course, the three-transformer version produces double voltage that's
>isolated from the input, whereas the above doesn't.  Also, you still
>have to watch the phasing; get a winding's leads swapped and you get
>zero voltage instead of doubled voltage.
>
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