[Elecraft] RS 22-507 Power Supply

[Bob Tellefsen]

Gus
I remember reading somewhere that switching supplies
require some minimum load to be stable.  You could
try putting a small resistive load, maybe 50 mA, on the
P/S and see if it calms down.
Good luck and 73
Bob N6WG

----- Original Message ----- 
From: "Augie Hansen" <augie.hansen at comcast.net>
To: "Elecraft Reflector" <Elecraft at mailman.qth.net>
Sent: Tuesday, March 27, 2007 9:04 AM
Subject: [Elecraft] RS 22-507 Power Supply 


> I have been using a Radio Shack switching power supply (part number RS 
> 22-507), which is a 13.8 volt, 3 amp supply both to power my K2 and to 
> power a test setup for a microcontroller project. The output is clean 
> and stable when the unit is powered on.
> 
> However, the supply is exhibiting a strange behavior when the unit is 
> turned off. It puts out a short full-voltage pulse (~0.2 second) at 
> intervals of several minutes. These pulses occur  whether the supply is 
> connected to a load or not. It is not related to anything on the AC 
> input side. The same behavior was seen at a temporary lab I set up in 
> Rhode Island and here in my lab in Denver.
> 
> I wonder if any of you have had a similar experience with this model or 
> any other switching supply. If so, please let me know.
> 
> 73,
> Gus Hansen
> KB0YH
> 
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