MOTM

In a message dated 4/9/01 3:41:56 PM, esresource@... writes:

<< I am just beginning my thought process for a modular for the studio (MOTM 
of course), and wanted to ask about the Power One Power Supplies. >>

The Power One power supplies are generically referred to as open-frame linear 
power supplies.  They are power supply circuit boards typically mounted to a 
combination mounting frame/heatsink.  Since they are "open-frame" they need 
to be enclosed somehow.  This is what is used in the MOTM-900, although it is 
packaged nicely with a front panel and such.  Go the MOTM route if you don't 
want to deal with the mounting issues or if you feel uncomfortable wiring 
120VAC devices.  This is the best route to go unless, as some people have 
mentioned, you need a huge power supply.

There are many places where you can buy these supplies new (Digikey, Newark, 
etc.) but I have found them surplus.  You are looking for a high-current +/- 
15VDC unit.  I bought mine from C&H Sales:

http://aaaim.com/CandH/

The +/-15VDC 1.5A model is Stock #PS9603 (Power One CP131A which also has 
5VDC @ 8A), the +/-15VDC 0.8A model is Stock #PS9910 (Power One HAA15-550).

For REALLY huge systems they also have some supplies with +/- 15VDC 10A 
outputs.  Great if you're into overkill.

Detailed info can be obtained from Power-One:

http://www.power-one.com/

By the way, people seem confused about low-voltage wiring.  Ever wire up a 
car?  Think low-voltage and high current when doing DC power distribution for 
a large MOTM system.  Sure, the supply may only have an 18 gauge 120VAC 
cable, but at 15VDC that 1.5 amps needs a bit of copper if it is travelling 
far.  Beefy is better!  Nothing ridiculous, but 14 or 12 gauge isn't out of 
the question.  Not to each module, but from the power supply to the power 
distribution board.

Ivan