Was miniature 14-V power supply for travel Rick I have renamed this thread because it has little to do with the original thread.
In general it should be possible to parallel two power supplies. The supposition theorem supports this idea however there are several practical concerns that suggest this is not a good idea. First, even if the output voltages are identical, the output impedance of the supplies may not be the same. The current will divide according to the output impedance so you may not get the kind of current sharing you are looking for. Second, some supplies have what is called foldover. This is the equivalent of negative resistance and can cause the two power supplies to fight each other. In extreme instances this can cause failures in either the load or the supply. If you need short term surge I suggest a small gel cell or supercap across the power supply output. de Fred, AE6QL -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Rick McClelland, AA5S Sent: Wednesday, July 06, 2011 9:24 AM To: Ralph Parker Cc: [email protected] Subject: Re: [Elecraft] miniature 14-V power supply for travel This brings a thought to mind, if I may briefly hijack this post. Is it acceptable to connect a Powerwerx 30 amp supply in parallel with a Gamma HPS1-a supply in order to increase the current/surge capacity of the Powerwerx supply? This seems reasonable in theory but I don't know if the two supplies might deliver slightly different voltages causing the regulator on one to malfunction or fail. Rick On Tue, Jul 5, 2011 at 10:26 PM, Ralph Parker <[email protected]> wrote: > >Have you looked at the one from Powerwerx ? > > > http://www.powerwerx.com/batteries-chargers/powerwerx-30-amp-desktop-s > witch > ing-power-supply-powerpoles.html > > I bought one. Not exactly miniature, but smaller than my Samlex 1223. > Runs the K3 + accessories easily. No noise issues (RF or acoustic) > that I could tell. I don't have a P3 (yet), but I'll betcha it'll fit > inside that case. > > Ralph, VE7XF > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html > -- Rick McClelland, AA5S Fort Collins, CO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
