[simpits-tech] How to hook up fans & lights??

[Jim Sturcbecher]

OK guys, quick rule-of-thumb power supply usage.

If you are using a switching type power-supply (as in a PC), then it is
always best to provide a load of about 10% of the rated max current of
the supply. Now the PC PSU is slightly different in that the main regulation
is done on the 5V output. All other outputs are then regulated in-step with
the 5V. So, if you can put this load on the 5V somehow, and you are
using one of the newer P4 type PC PSUs, you have at least 12Amps
available on hthe 12V output and probably 30Amps or more on the 5V.
If you pick up an older PCU, say 200W; then load the 5V to about 2A.
You then have another 14Amp plus on the 5V and probably 6A on the
12V available. Remember, if you use a resistive load, it will need to
dissipate the heat (lots of it) otherwise use something like a 12V car
headlamp bulb on the 5V which will glow dimly but will draw enough
to make the PSU happy.

Good luck.

Jim.

At 8-5-03 11:23, you wrote:

>as far as i can recall, only the ATX PSU's need load the old AT ones don't,
>Please correct me if I'm wrong
>
>Ido
>
>              Roy Coates
>              <roy@flightlab.li
>              v.ac.uk>                                                   To
>              Sent by:                  simpits-tech@simpits.org
>              simpits-tech-admi                                          cc
>              n@simpits.org
>                                                                    Subject
>                                        Re: Re: [simpits-tech] How to hook
>              05/08/2003 11:58          up fans & lights??
>              AM
>
>
>              Please respond to
>              simpits-tech@simp
>                   its.org
>
>
>
>
>
>
>On Wed, 7 May 2003, Dave Hensley wrote:
>
> > Do you use that outside a PC case Frank? If so, any issues like grounding
> > that need to be taken into account? I actually have a couple PSU's
>sitting
> > around and would love to be able to put them to use.
> >
>
>This is something of an old chestnut, PC PSU's are dirt cheap and for
>whatever reason we all seem to have a couple lying around!
>
>The only caveat is that the PSU expects a substantial load to be present
>at all times.
>
>Maybe someone with a better memory than I can remind us all of the
>details?
>
>Roy.
>
>
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