[RndTbl] partial PS use?

Wyatt Zacharias wyatt at magitech.ca
Mon Feb 15 16:04:45 CST 2016


I've never used the 5v rail on its own, but I've used the 12v rail for
various things. They do make great high amperage supplies. You have to
short the green wire in the main 24 pin connector with one of the many
black ground wires and then it'll turn on.

--
Wyatt Zacharias (mobile)
On 15 Feb 2016 3:59 p.m., "Hartmut W Sager" <hwsager at marityme.net> wrote:

> The -5V and -12V are probably fine with no load, but the +12V line should
> have at least the minimum required load (whatever that might be).  Just use
> a suitable power resistor (power resistor means it won't fry into a molten
> lump) on the +12V line.  In the absence of info on the PS label, I'd go for
> loading the +12V line with about 10% of its maximum power/amps.  Use V = IR
> and P = IV to do the algebra to get the right resistance (ohms).
>
> Also, along the lines of Adam's reply, you might have to signal back to
> the PS (by closing a circuit?) that "this motherboard likes you" -
> otherwise the PS might cut out.
>
> Hartmut W Sager - Tel +1-204-339-8331, +1-204-515-1701, +1-204-515-1700,
> +1-810-471-4600, +1-909-361-6005
>
>
> On 15 February 2016 at 15:39, Trevor Cordes <trevor at tecnopolis.ca> wrote:
>
>> Is it possible to use a standard AT (old style) computer power supply just
>> for its +5v out?  I have a project and I just need 5v with a beefy amount
>> of amps, and I have lots of AT PS's around that would fit the bill, but
>> I'm wondering if running a computer PS just for its 5v line might damage
>> it somehow?  There would be no load on the 12v (and other) lines.
>> Anything I should worry about?
>>
>> Thanks!
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>
>
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