[ICOM] Possible power supply

[Jim Miller]

The "ST. Louis Switcher" was designed and built by Matt Kastigar W0XEU and
published.  I too think it was in the QST magazine a few years ago.  I
suspect one could search for the article on the ARRL website.  The PC supply
can have it's main current draw diverted to 12 Volts so you get the main
current there so you get considerably MORE than specified for the 12 Volt
normally supplied by the supply as is.  The regulation as I remember the
article is done from the 5 volt sampling (which follows along) and must have
a token load built into the conversion.  It works.

73, de Jim KG0KP

----- Original Message ----- 
From: "Larry Winslow" <larry_w at comcast.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Saturday, May 05, 2007 3:02 AM
Subject: RE: [ICOM] Possible power supply


Interesting. I've been using a PC supply from the
early 90s for a 5v source for many years now.
Maybe I should stop - although my experience has been good.

I seem to remember an article in QST (I think) describing how to do it.

Larry

At 12:50 AM 5/5/2007, you wrote:

>Hi Larry,
>
>One should be very cautious when powering radio equipment from a power
>supply which is not specifically designed to operate in an RF environment.
>There could be some nasty EMC surprises, such as an overvoltage spike when
>keying the transmitter.
>
>This actually happened to me once, with a Lambda 12V 35A OEM computer power
>supply.
>
>Cheers for now, 73,
>Adam VA7OJ/AB4OJ
>
>
>-----Original Message-----
>From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
>Behalf Of Larry Winslow
>Sent: Saturday, May 05, 2007 00:35
>To: icom at mailman.qth.net
>Subject: [ICOM] Possible power supply
>
>I've always been intrigued with the possibility of using a computer supply
>to operate ham equipment. Today I found what might be a winner.
>
>My just arrived issue of PC Magazine contained a product announcement on
>page 78 of a power supply which specs 12v @ 60a. I went to the web site
>given and the specifications do look good - especially the noise reduction
>figure. The MSRP is $199 but I suspect it can be found for a lower price.
>The site also listed additional supplies with lower amperage figures.
>
>73 - Larry WØNFU
>larry_w at comcast.net
>
>
>
>
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----
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