[Elecraft] RS 22-507 Power Supply

[Augie Hansen]

Bob Tellefsen wrote:
> 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

Hi Bob,

The loads on the supply are greater than 200mA in each of the operating 
cases I described. My concern is not with output stability under load. 
Rather, I want the supply to really be off when I turn off its power 
switch. It apparently isn't, producing those unexpected pulses.

I was alerted to this problem when my computer kept displaying messages 
about a network connection being connected and disconnected 
periodically. The PIC MCU project I'm working on has a Lantronix XPort 
IP-to-serial interface unit on it, and the short bursts of power were 
causing it to wake up and respond over the network.

Thanks,
Gus