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Re: [Amps] Series PC Power Supplies

To: Amps <>
Subject: Re: [Amps] Series PC Power Supplies
From: Joe Isabella <>
Reply-to: Joe Isabella <>
Date: Thu, 1 Jun 2006 11:57:33 -0700 (PDT)
List-post: <>
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" 
Joe, N3JI

----- Original Message ----
From: aborg <>
To: Amps Amps <>
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 yet.
Here it is. I am attempting to series 3 pc pwr
supplies. I can't seemed figure why I'm only seeing 5+
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 VDC
outputs of three separate supplies together in series.
This will provide you with +15 VDC at 25 amps on up to
the maximum rating of the supplies you have acquired."
Can someone be kind enough to relieve from my
embarassment ?



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