Even using diode-isolation between the supplies could still result in 1 supply driving most of the load. Though wasteful, you can add series resistors (ballast resistors) from each supply, to help balance-out the loading.
I think the best solution is to use a single supply that will provide the required current, plus some extra margin. If that isn't possible, split the loads so they are on independent supplies. On Friday, August 19, 2022 at 3:32:34 PM UTC-7 flata...@gmail.com wrote: > I thought so too, but I’m thinking that the regulated HV pulses from one > power supply may impact the feedback resistor(s) on the other power supply, > potentially messing up the feedback loops on both sides. > > I could add a HV diode such that current doesn’t flow from one power > supply into the top resistor of the feedback divider from the other power > supply, if it makes any difference at all (drop out voltage is tiny anyway). > > > On 19 Aug 2022, at 23:28, Moses <mo...@neonixie.com> wrote: > > If the voltage from both supplies are about the same and the resistors on > the tubes are the same.. the brightness will be about the same. I don't see > how there would be a difference. > > Regards, > -Moses > > On Friday, August 19, 2022 at 3:12:00 PM UTC-7 flata...@gmail.com wrote: > >> Hello, >> >> As mentioned in one of my previous posts, I'm building a nixie clock with >> Dalibor's RZ568M tubes. >> >> The idea is to make the base as thin as possible and to achieve that I am >> using two power supplies, each with a transformer that is about 6mm tall. >> >> If I build a clock with 6 tubes and 2 colons, I can allocate 3 tubes + 1 >> colon to each power supply and the brightness is nicely balanced. >> >> If I build a clock with 4 tubes and 1 colon divider, then I am not sure >> if I should allocate 2 tubes + 1 colon to a power supply and 2 tubes only >> to the other power supply. If I do so, the brightness in the 2 tubes only >> will be different than in the 2 tubes connected to the colon. I could use >> PWM to adjust brightness but let's assume that I just do direct drive with >> no PWM. >> >> I thought, is it possible to put two HVPS in parallel as you'd do with >> the batteries to increase overall current for a higher load? I don't think >> that's possible with DC/DC boost converters as it messes up the voltage on >> the top resistor of the voltage divider/feedback loop. I can always try and >> experiment but wanted to hear any suggestions before frying two power >> supplies. >> >> I have built a larger power supply that can take all 6 Nixies etc but the >> transformer is much taller of course, so I am not using that one. >> >> I could add a third mini power supply just for the colon, but it seems >> overkill to have 3 power supplies! >> >> Any thoughts? >> >> Thanks, as always. >> Max >> > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neonixie-l+...@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/28dc3079-a49a-4fdb-aa23-03ecaaf82037n%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/28dc3079-a49a-4fdb-aa23-03ecaaf82037n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/23c3d3b1-b68a-42b9-93b8-7fd1d795a8ecn%40googlegroups.com.
