Hi Joseph,
On Sunday 07 May 2006 23:47, Joseph Harrison Scribbled:
> Hello
> This is what I got from asus, checked more than a dozen power
> supplies and most only have 30 amps on
> the +5 volt, the first 1 found with more was a 620 amp Enermax which
> has 32 amps +5 volt.
>
> Thank You Joe
A good point to check !
> Greg S wrote:
> > Stabilty Problems
> >
> > The stability problems you are seeing can usually be narrowed down
> > to 1 of 4 things
<--Snipped-->
> > Run the system out of
> > the case and see if the stability problems you are having have been
> > resolved, if after testing it out of the case it has become stable
> > then before you mount it back into the case take some standard
> > black electrical tape and make a cross over each of the metal
> > stand-offs you are screwing the board down into mount the board and
> > screw down thru the tape.This will do 2 things first it will insure
> > your board against any metal to metal grounds and will also lift
> > the board up away from the case slightly preventing any EMI
> > interferance from say a solder ! point that was sitting to close to
> > the case.
Whilst in general I agree with the suggestions made ! I do disagree
with these comments about insulating the mounting pillars !!
If you look closely at the mainboard, you will see that the mounting
screw holes are plated through ! So adding tape over the mounting
pillars will only have the effect of raising the board by the thickness
of the tape used !! The screw will still make an electrical connection
to the groundplane !!
Indeed the added inductance of the thread of the/each screw may actually
be detrimental to the stability, particularly at gigahertz
frequencies !! The metal mounting plate forms part of the groundplane
for the mainboard and is instrumental in controlling trace impedances
on the underside of the mainboard. Increasing the mainboard to
groundplane separation will raise these impedances slightly ! This may,
or may not, be of benefit !
--
Best Regards:
Derrick.
Pontefract Linux Users Group.
plug at play-net.co.uk
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