On my boards for 6 x RZ568M tubes I do exactly that - I use two HV supplies and have divided the HV supply line into two - one for the left and one for the right, one HV module for each.
If using 4 tubes and one colon - and you still want to share the load between two supplies - then why not split the supply to the two neons in the colon - one to the left and one to the right? If your colon has only one neon then are you concerned that the effect of lighting one neon will make a visible difference to the overall tube brightness on one side? I would have thought (but have not tested) that the difference would not be noticable (ready to be proven wrong!). Assuming that is the case - then what effect would the difference between displaying an '1' or and '8' one one tube (different currents) have on the adjacent tube on the same HV Supply? Put yet another way - is there a visible effect on any tube on any clock when a colon neon is illuminated? (there could be - I've just never noticed it - also I have a head full of a cold at the moment and all thinking is clouded!). I don't know what HV modules you are thinking of using and although I've not done this myself - I did see a neat trick where someone was using Omnixie NCH8200HV modules which they recessed into a suitable hole in the PCB - assuming space permits - this allows you to trim the PCB thickness off the overall height. - RIchard On Saturday, 20 August 2022 at 00:14:23 UTC+1 [email protected] wrote: > Going to clarify a but.. I was referring to using separate supplies for > tubes, NOT paralleling them together. As others have said problems arise > when you parallel two switch mode supplies. > > Back to the comment, if you use one supply for one tube or two or ?? And > another for colons or other tubes, doesn't matter the number. I really > don't see a problem. > > Regards, > -Moses > > On Friday, August 19, 2022 at 3:28:40 PM UTC-7 Moses 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 [email protected] 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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/f136f02f-4a1b-4a2d-8551-1679e8140bf8n%40googlegroups.com.
