[hpsdr] Starting BOM already

[Horst Gruchow]

Hi, Chris 
this might by true for this particular picoPSU-120. I have two no-name ATX supplies lying around where you do not 
get a stable output unless loaded at the 5Volt line. I intend to use one of them for the ATLAS. Therefore I have to 'burn'
some energy besides putting some fuses in the DC lines to limit the blow-up effect if something goes wrong. The 15 A delivery at the 5 Volt line as well as the 10 A on 12 V otherwise could burn my house!!!!! or do some nice welding in the shack.
At least the ATLAS board would have some nice bubbles causing an interesting 3D effect.

73
Horst
DL6KBF

----- original Nachricht --------

Betreff: RE: [hpsdr] Starting BOM already
Gesendet: Sa 25 Mär 2006 19:05:21 MET
Von: "Christopher T. Day" <CTDay at lbl.gov>

> Horst,
> 
> My Googling led me to understand that the issue is one of stability of
> switching power supplies - particularly multiple output voltage ones -
> under low load; I think that the feedback signal gets too small in some
> designs. The point here is that it depends on the details of the
> particular power supply design. One option would be to keep the minimal
> load resistor, or whatever, inside the PSU box, but for cost reasons,
> that's often not done. Anyway, it seems to really depend on the power
> supply in question and apparently the picoPSU-120 is intrinsically
> stable. No need to waste any of its output on a dummy load. We'll see.
> 
> 
> 	Chris - AE6VK
> 
> 
> -----Original Message-----
> From: H. Gruchow [mailto:horst at needles.de] 
> Sent: Friday, March 24, 2006 10:32 PM
> To: Christopher T. Day; Eric Ellison; Philip Covington
> Cc: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] Starting BOM already
> 
> ...
> 
> in the back of my head I have a figure of around 50mA of minimum current
> the 5 Volt line should be loaded with on an ATX supply. ...
> 
> 73
> Horst
> DL6KBF
> 

--- original Nachricht Ende ----


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