You shouldn't try to put them in series, at minimum they are grounded
and you'd have to defeat at least one of the grounds to connect them.

The supply typically only regulates one output (5v or 3.3v) and depends
on the transformer windings to generate the other voltages relative to
the 5v winding.

To change the 12v to 10v, you'll likely need to rewind one of the
transformers.

Alternately, put some 24A diodes with specified votlage drops in the 12v
line.  They would need to drop 2v at 24A, or 50W or power and would thus
need beefy heat sinks and a fan.  But such a module could still be
fairly small - possibly fitting inside the powersupply if needed, using
the power supplies own fan.

Don't try to parallel the diodes to reach the current.  You can do it if
you carefully match them and use balancing resisters, but it's always a
messy fix for something that can be done easily and cheaply with proper
diodes.

-Adam

Edson Brusque (Listas) wrote:

>Hello,
>
>    I'm needing a 10V/24A power supply and noticed most modern ATX (PC
>computer) power supply have a 5V/25A and a 12V/10A outputs.
>
>    It would be easy to change an ATX power supply for 10V output? What
>about using two suplies with it's 5V outputs in series?
>
>    Thank you very much,
>
>    Brusque
>
>-----------------------------------------------------------------
>Edson Brusque                 C.I.Tronics Lighting Designers Ltda
>Research and Development               Blumenau  -  SC  -  Brazil
>Say NO to HTML mail                          www.citronics.com.br
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