After re-analysis it seems that I need to cut the
traces to float the groounds.
Thanks to all
--- Joe Isabella <email@example.com> wrote:
> Two things...
> 1. You can get a brand new 25A switching supply for
> $80-90 if you look around. I bought my Samlex 25A
> for $80.
> 2. How did you series the supplies you have? The
> "first" one will provide your "ground" connection.
> Take the red wires from that and connect them to the
> black wires of the "second" supply. Now take the
> red wires from that one, and connect them to the
> black wires of the "third" supply, which will
> provide the positive (15 VDC from the black wires of
> the "first" supply to the red wires of the "third"
> supply, in this case) to your rig. Make sure you
> tied the orange wires to each supply's red wires so
> they all see "power good" line properly. Make sure
> you have isolated the black leads from chassis
> ground on the second & third supplies as as the
> article says since they need to be floating
> (otherwise, the 5V from the first & second supplies
> will be going straight to ground). If you didn't
> isolate them, you'll only see the 5V from the
> "third" supply...
> Joe, N3JI
> ----- Original Message ----
> From: aborg <firstname.lastname@example.org>
> To: Amps Amps <email@example.com>
> Sent: Thursday, June 1, 2006 9:09:38 AM
> Subject: [Amps] Series PC Power Supplies
> Hello Amp'ers,
> Quick technical question. I'm embarrassed that I
> can't figure this out, but not quite a super tech
> Here it is. I am attempting to series 3 pc pwr
> supplies. I can't seemed figure why I'm only seeing
> volts. The link to the article is below. Here is an
> excerpt from the article. "Our second means of
> utilizing this low cost power is to connect the +5
> outputs of three separate supplies together in
> This will provide you with +15 VDC at 25 amps on up
> the maximum rating of the supplies you have
> Can someone be kind enough to relieve from my
> embarassment ?
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