On Sun, 2012-09-09 at 20:50 -0700, vk4tux wrote: > Ok, I was thinking the P3/SVGA drew less current at 15v than 12v, due to the > 5/3.3/2.5/2.2 v pwr supply setup requiring less current at 15v input than it > does at 14v input or less.
That's right. > I checked the K3 output with a 20 ohm/50w variable rheostat and it trips at > 0.6amp or 600mA on my fluke 87. With a 15V supply, the P3 current is probably low enough that it will run OK from the DC output jack of an unmodified K3. The modification is still worthwhile (1) so that the P3 will still work if you (or someone else) tries to run it on a lower-voltage supply, and (2) because the modification reduces the voltage drop to the DC output jack. Alan N1AL > > > > > > > What most people notice is that the P3 will switch off after a period of > operation when the resettable fuse finally heats enough to open. Your K3 may > have a defective resettable fuse in the 12V output line. > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/Small-got-ya-to-watch-for-when-doing-the-K3-12VDC-Out-Current-Mod-tp7562356p7562362.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
