That's really helpful. Just to clarify. I don't actually want to dim the displays, in was really just trying to stop them from heating up. I'll check the specifications for temperature range. It is very easy for me to adjust the HV supply downwards which would then reduce the segment current. I shall experiment and report back Richard
On Fri, 7 Feb 2020, 16:59 gregebert, <[email protected]> wrote: > Fundamentally, it should work, but be aware you are now pulsing the > displays. Some folks in this group have reported audible noise from > multiplexing. Some panaplex displays require multiplexing by the nature of > their pinout (common cathodes, separate anodes) so that would be a moot > issue. Instead, you would adjust the duty-cycle of your multiplexing scheme. > > Another option is to reduce the anode voltage under software control; how > that is done depends upon the type of supply you have. If you are using a > DCDC converter, you would change the resistance value in the feedback loop. > > I wouldn't worry too much about the generated heat as long as your case > allows the heat to escape via natural convection; you dont need a fan. Your > display will consume 4W peak, and for a clock it's probably around 2W > average. Given the large surface area, and black color, it's going to > radiate heat efficiently which minimizes the temperature increase. I've > checked nixie tubes with a handheld IR thermometer, and the measured > temperature is on-par with what I would guess by touching it. I dont think > I've ever measured above 40 C, and that's well-within the datasheet spec of > 70C ambient temp. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "neonixie-l" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/neonixie-l/0f9uCa5EgsU/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/6150508f-c0fb-42ba-9c66-a7c864bcd384%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/6150508f-c0fb-42ba-9c66-a7c864bcd384%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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CA%2B9r3s9xCaGJo-x-r2QZ8%2BUMWu4nFB00TsmnjcFC9DFu2rc8rg%40mail.gmail.com.
