I’m having trouble finding a 250V DC power supply that can generate 1/4 amp. Meanwell were the closest I have got so far.
I’m looking for something to drive 4 banks of 26 tubes arranged as a seven segment display. Using a bench supply, it seems that 250V is the smallest voltage that will reliably light them, and one bank I tested drew 237mA when lit. Then I’ll have to figure out some way to control them. > On Feb 21, 2020, at 12:38 AM, gregebert <gregeb...@hotmail.com> wrote: > > > You probably just want a HV supply, about 250 VDC, and a fuse instead of a > constant-current supply. > > I think IN-28's are rated at 13mA, so you could arrange them in groups of 16 > with a 1/4 amp fast-blo fuse to protect each group. > > If power consumption is a concern, you can get clever and step-up the voltage > to 250VDC for a few hundred usec when you know tubes will be turning-on, and > throttle-back to around 180V for sustaining. > -- > 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/imrmZ6PC1vw/unsubscribe. > To unsubscribe from this group and all its topics, 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/186f0041-d25e-44e8-9af4-cbad7bf8edd3%40googlegroups.com. -- 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/CB2C4A00-4E33-4EB7-94C3-B570B1649175%40gmail.com.
