get power from pci bus

i want to connect a cart to pci bus just to use +12,-12,0&+5 v power
lines of it
now i want to know if i need to change any settings for the bus or its
enough to connect the board to the bus
and also what should i do to protect my pc from damages may be happens
after connnecting the card like overcurrent or etc
thanks

In article <1149927147.617918.60430 RemoveThis @c74g2000cwc.googlegroups.com>,
moodi.h RemoveThis @gmail.com wrote:

> i want to connect a cart to pci bus just to use +12,-12,0&+5 v power
> lines of it
> now i want to know if i need to change any settings for the bus or its
> enough to connect the board to the bus
> and also what should i do to protect my pc from damages may be happens
> after connnecting the card like overcurrent or etc
> thanks

The power is always present, so there are no BIOS settings.

You should remember that the gold fingers on a PCI card,
have limited current carrying capability. If you wanted
to draw 10 amps, the pins would burn off. Each gold
finger will have a much lower current rating, like maybe
1 amp or less.

To protect the motherboard, you should use fuses on each
voltage line. Then, if there is an accident, the fuse
will open. If you use a fast blow fuse, like a Picofuse,
that affords maximum protection, but if the load you
are plugging in has quite a surge current when it is
first powered up, the fuses may not last.

I think your question would be answered better, if you
told us something about the load you were hoping to power.

The -12V on a lot of power supplies, is very weak, and
would not be a good option for driving heavy loads.

A Molex disk drive connector, gives you access to +5V
and +12V, at reasonable current levels (at least 6 amps).
You don't need to fabricate a PCI card, to get at
the power.

Paul