[hpsdr] Converting a PC Power Supply for External Use

[Eric Ellison]

Mark

 

Need to reply to all on these. Thanks for the search. Board will draw minor
amounts of current compared to what is available.

 

Eric

 

 

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From: Mark Ericksen [mailto:merickse at tampabay.rr.com] 
Sent: Tuesday, March 28, 2006 9:45 PM
To: Eric Ellison
Subject: Re: [hpsdr] Converting a PC Power Supply for External Use

 

Eric

 

After reading your message I went over to the Newegg website, www.newegg.com
to spot check a few PC supplies.  I found that some supplies have -5 V and
some do not.  The ones that do have -5 V usually deliver a low current such
as 0.5 A.

 

I got to thinking that -5V could be derived from the -12V line by adding a
small linear regulator or by using some other means, and placing it in the
PC power supply being used.  Then I noticed that the -12V lines usualy don't
supply more than a few amps, if that.  So now I am wondering how much
current will be needed to power Janus, Lionheart, and Mercury?  If these
boards will end up using +12 V and -12 V would 2 amps  on the -12 V line be
enough?  Would 1 amp be enough?  A number of supplies provide less than 1 A.
Possibly the -12 V line won't be very useful either.  There certainly is
plenty of current available from +12, +5, and +3.3 though.

 

It may turn out that Atlas should be powered from a totally different power
supply.

 

Have the voltage and current estimates for the other boards been specified
yet?

 

As far as my opinion on leaving -5 volts on Atlas I think it should remain.
It may turn out that the -5 V line will be needed.  Hey, it can't hurt to
leave it in.

 

Thanks for asking my opinion, I appreciate that.  Keep in mind I don't have
an engineering degree nor am I functioning at the technical level of many of
the folks in this group.

 

Thanks

 

Mark Ericksen

----- Original Message ----- 

From: Eric Ellison <mailto:ecellison at comcast.net>  

To: 'Mark <mailto:merickse at tampabay.rr.com>  Ericksen' 

Sent: Tuesday, March 28, 2006 8:22 PM

Subject: RE: [hpsdr] Converting a PC Power Supply for External Use

 

Mark

 

 

Thanks for the contribution. I don't think I have seen this one before.
Since we are including all power busses available, I was a little concerned
that the -5 V might not be available on later supplies. Since we are still
in alpha stage should we drop the -5 for the -12 only?

 

 

Eric

 

 


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From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of
Mark Ericksen
Sent: Monday, March 27, 2006 6:18 PM
To: hpsdr at hpsdr.org
Subject: [hpsdr] Converting a PC Power Supply for External Use

 

I found this website concerning alternate uses of PC power supplies very
interesting, so I thought that I would share.

 

http://web2.murraystate.edu/andy.batts/ps/powersupply.htm

 

 

 

Mark Ericksen

AD4MA

Clearwater, Florida

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