MOTM

First off, thanks to everyone for the suggestions.  I've pretty much 
decided to build the power supplies in their own case with a fan. I 
have a SKB 4-space sitting around unused that I will probably adapt 
for that purpose.  I'm going to put two 5A +/- 15V Power One supplies 
in the box to allow for expansion.  I have modules either purchased or 
on order to fill about 140 of the 170 spaces in my case.  I have used 
published power supply requirements and extrapolating to a full case 
come up with about 3.75 A on the plus side and about 3A on the minus 
side, which is within Paul's 80% rule.  I will use the second supply 
as a backup and for future expansion.  
As far as airflow within the cabinet, its sort of like a resistor, any 
bends and slots the air has to flow through are resistors and the fan 
is the electromagnetic potential.  Two fans, one in and one out helps 
to overcome the resistance and allows for greater airflow, (current.)
I'm not to worried about dust.  This thing is staying in the studio, 
where it's being built, and the studio is pretty clean, no smoking 
etc.  But I may try the cabinet without fans first and just see how 
hot it gets.  I'll possibly stick a couple of thermocouples in it and 
let it heat up.  As I said before I calculate 90 watts heat generation 
for the whole cabinet if the supply is isolated.  Thats really not a 
lot spread over 20 sq. ft. of panel.
I hope to get pictures of this thing soon.  I've got the case in 
pretty good shape, but I'm working on the finish as this thing was a 
bookshelf for a long time, and its a little scarred where I tore the 
shelves out.  Thats not as bad as it sounds because I built the 
bookshelf originally.  I'm way behind on building modules though, I've 
got about 17 built out of about 40 received, I'm still waiting on 30 
something modules from Paul, something like 9 from Oakley and 4 from 
Stooge Larry, plus a whole lot of stooge panels.  I'm still working on 
a few of my own designs as well.
Anyway Thanks to all.
Paul Haneberg

In the case of the Blacet PS500, you can run this right out to 500 mA,
and not worry about the "80% rule". We designed this supply to operate
at 750 mA, but derated it for cooling, European power, and low domestic
supply purposes. We test them all at +/-750 mA for an hour before
shipping.

Regards,
___________________
John Blacet
Blacet Research
http://www.blacet.com