Pondering the backup power issues for my BVA a bit more, I am thinking a dedicated DC battery bank (maybe 5 or 6 nominal 6 volt batteries in series) powering a suitable linear regulator circuit is probably the direction I will go in. I suspect there are more elegant and or simpler approaches but I think from my perspective as a hobbyist this is probably the best direction for me.
I like the idea of using a diode arrangement to facilitate changing the power source for the BVA. I expect I will also add some form of over voltage protection as well. I need to ponder the likely voltage drops in the voltage regulator and diodes along with the voltages the batteries will provide as they discharge under load. It seems I have another winter project. Thanks all for the suggestions. Mark Spencer m...@alignedsolutions.com 604 762 4099 > On Sep 25, 2020, at 7:16 AM, Magnus Danielson <mag...@rubidium.se> wrote: > > Hi, > > On 2020-09-24 23:47, Tom Van Baak wrote: >>> Next time I power down mine is to integrate a new supply and back-up >> >> May I recommend PowerPole connectors and frequent use of diode-OR. For >> details see: >> >> http://leapsecond.com/pages/powerpole/diode-or.htm >> >> I got the inspiration when my Dad was in the hospital and I saw how >> they did IV tubes with multiple injection points. It seemed so simple, >> clever, reliable. Details [1] and graphic photo [2]. >> >> So now I use diode-OR "Y" connectors on all my long-term standards. It >> allows me to replace either power supply live without interruption at >> any time. Come to think of it, they call it an IV in the hospital. And >> here in my lab the I is about 0.18 and V is 24 so my IV is 4 watts. ;-) > That's how we do it in Telecom, but on the 48V level. I managed to drive > my company into do it with 48V all the way to the various boards, > because that way the protection switching out there handled multiple > faults. Also, for some reason there is this line of DCDC converters from > 48V to about anything. We kept doing that since, even if the diodes now > been replaced with MOSFETs to lower losses. > > If you look into say the 5065A that's how it's done there too. > > As for power-pole, those are great connectors, but I need to keep 12V, > 24V and 48V in the lab, so I need to get the different color codes not > to interchange them. You usually react when you see a yellow-black > trying to mate with a red-black. So, I recommend folks to do the same. > Once one got started with the Anderson PowerPole, it becomes more and > more a solution. > > But yeah, thanks for reminding me that I need to progress on the > power-pole and power supply projects. I'll do that after the PiDP-11 > project. > > Cheers, > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.