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

[Roy Coates]

On Thu, 8 May 2003, Jim Sturcbecher wrote:

> 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.
>

Thanks Jim.



Roy.