Hi Richard, David, I'm using my design of the NCH8200HV, it's mostly its replica as I wanted to embed the design in my board and I'm not bothered about the 'not invented here' syndrome as I'm not selling commercially. 'Sinking' the HVPS into a pcb cutout is a good idea though, I had seen that too. I thought about allocating each neon of the colon to a different power supply but I'm using the colon made by Dalibor and it has only one anode and two cathodes, so...I may add a separate power supply just for the colon and I have a trimmer resistor on each power supply (thanks for the suggestion David) to adjust brightness before doing anything via software. You are right that turning on '1' and '1' (say for Hours) on the same power supply may have different brightness than '4' and '8' on the other supply (say for Minutes). I'll be using different resistors for each digit as suggest by Dalibor, there could still be a small difference in brightness, but I'm not planning to solve for that. I don't think it's noticeable, if it is, I'll adjust from software, but there are many combinations to consider, so that's definitely overkill.Of course I have and I can use one big power supply for everything but I'm trying to keep the final case as thin as possible. -------- Original message --------From: David Forbes <nixiebu...@gmail.com> Date: 20/08/2022 06:42 (GMT+00:00) To: NeoNixie <neonixie-l@googlegroups.com> Subject: Re: [neonixie-l] HVPS in parallel I would hope that your power supplies have regulated voltage, correct? Therefore they should both be the same voltage, within the tolerance of the voltage determining components, if the supply design has good load regulation. In the worst case, provide a voltage trimmer on one supply so that you can adjust it to balance the brightness of both sections.You may want to do that even in the case of equal loads, since a 1% difference in HV voltage will make about a 5% difference in cathode current due to the fact that the dropping resistor works over a small fraction of the HV voltage. On Fri, Aug 19, 2022, 3:12 PM Max DN <flataeg...@gmail.com> wrote:Hello,As mentioned in one of my previous posts, I'm building a nixie clock with Dalibor's RZ568M tubes.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.
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