Ah, I see.  I didn't catch the initial supply specs.

You are right that the windings (as well as other components) would have
to be changed in order to yield more current from the 12v side.  It may
even be easier to mess with the 5v side and try to bring it up to 10v,
but a rewind would probably be necessary for that as well.

-Adam

Mike Singer wrote:

>M. Adam Davis wrote:
>
>
>>I agree that the uneven load (little load on 5v, heavy load on 12v)
>>would be bad, but I suspect that since most new motherboards
>>use the 12v
>>extensively (and sometimes more than the 5v) then it may not be a
>>problem - obviously something that would need to be tested.
>>
>>Why would the coils need to be rewound with thicker wire?  They are
>>still seeing the same voltage and current (12v at 24A).  The
>>diode drop
>>shouldn't affect them at all...
>>
>>
>
> PSU mentioned had 5V/25A and a 12V/10A outputs.
>If we want to double 12V-coil current, we are to double
>wire section (thicker wire).
> I do not see for what "new motherboards use the 12v
>extensively" - 3.3v for processor, chipset and AGP video.
>HDD is about 12V/0.5A.
> I can't predict what effect would be, when we place
>full load to 10v coil, trying to stabilize 5v. It is 5v coil, that
>is usually stabilized in AT PSU, if I'm not mistaken.
> So we should transfer stabilization to 12V coil. With old
>AT PSUs based on 494 chip it isn't a big problem.
>
>   Mike.
>
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