I've used 1U ATX-style units from Sparkle Power 
http://www.sparklepower.com/proPCPS_Micro.html.  As long as you can meet the 
minimum load requirements, they're a lot of power supply for the money 
(approx. US$40).  I've never had one fail (out of approx. 200 pieces), and 
they're considerably more affordable than open-frame OEM supplies which 
typically have fewer outputs.

RR

----- Original Message ----- 
From: "Harold Hallikainen" <harold@hallikainen.org>
To: "Pic List" <piclist@mit.edu>
Sent: Thursday, February 14, 2008 12:54 PM
Subject: [EE] Internal Wall Wart?


> It SEEMS that we end up spending thousands of dollars to get UL safety
> testing on the following:
>
> 1. A UL listed power supply
> 2. A UL listed power switch
> 3. A UL listed power inlet
> 4. A few pieces of wire and a ground lug
>
>
> It SEEMS that it should be possible to avoid all this if there were
> something like the old PC power supplies that had the inlet, power switch,
> etc. all enclosed in a box with just the DC outputs coming out of the box.
> We'd shove the power supply up against our rear panel and have no line
> connected circuitry in our product other than that "pre-approved" box. I
> think this is similar to using an external low voltage power supply.
>
> So.. does the group think this would reduce or eliminate UL safety testing
> costs? Does anyone know of any power supplies like this?
>
> THANKS!
>
> Harold
>
>
>
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