Archive of the former Yahoo!Groups mailing list: 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