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" <[EMAIL PROTECTED]> To: "Elecraft Reflector" <Elecraft@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 > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
