After re-analysis it seems that I need to cut the
traces to float the groounds.
Thanks to all
*****************************************************
--- Joe Isabella <n3ji@yahoo.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 <a_borg@yahoo.com>
> To: Amps Amps <amps@contesting.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
> 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 ?
>
> Thanks
>
> http://www.antennex.com/preview/archive3/powers.htm
>
> Mike-KK4MS
> a_borg@yahoo.com
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam
> protection around
> http://mail.yahoo.com
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
Mike-KK4MS
a_borg@yahoo.com
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|