Worse even is that MOST newer monitors now have INTERNAL power supplies. They are switched, multi-voltage output, and almost impossible to hack.... I was going to hack my monitors and put a linear dc supply before the transformer/regulators.... no joy. Only way to make the monitors DC only in my case is to find the various voltage output rails and cut in individual DC supplies in and completely hack the existing PS circuitry out of the design.... not at all a trivial exercise. I will pick monitors better and have the DC supply plan in place for the next monitor go around.... <frown> Same frustration in trying to hack most laptop power supplies.... 18.5 vdc nominal, but with special circutry that cause the battery/laptop/charger to talk.... no talk, and the PS won't charge the battery.... yadda yadda... Best case scenario is to just power the laptop directly from battery pins... BUT you STILL have to then trick the laptop into recognizing the DC PS as a battery. Dell won't even think about talking to me about the battery pinout and the power good logic.
Sent from my Verizon, Samsung Galaxy smartphone -------- Original message --------From: Jim Brown <j...@audiosystemsgroup.com> Date: 5/11/18 15:44 (GMT-06:00) To: elecraft@mailman.qth.net Subject: Re: [Elecraft] P3 to video Great idea, Michael. But with one important possible gotcha -- virtually all of the power supplies for monitors like this are switch-mode types, and almost all generate RF noise. Several years ago, we were lucky to identify several Samsung models that run on a nominal 14VDC, and that work fine on the 12-14VDC that most of us have in our shacks (or on older linear 12V wall warts). Most newer models run at higher DC voltage, so to kill the noise they generate, we much find a suitable linear power supply for that voltage. BTW -- someone gave me a Samsung with touch controls because it was an RFI nightmare -- the monitor itself generated lots of noise AND the display went nuts in the presence of RF. 73, Jim K9YC On 5/11/2018 1:05 PM, Michael Blake wrote: > Dennis, I use a Samsung display that has 2 HDMI inputs and allows the monitor > to display 2 inputs side by side. You may even be able to find a monitor > with 2 VGA inputs that supports PIP. VGA to HDMI convertor cables are > plentiful as well. > > The secret is a 2-input display that support PIP. Mine is a current Samsung > 28” 4K display and I run the Mac on one side and the Windows 10 NUC on the > other, Works well. ______________________________________________________________ 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 Message delivered to k...@montac.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 Message delivered to arch...@mail-archive.com
