On Thursday, July 23, 2015 at 10:38:26 AM UTC-4, Chaos Hydra wrote: > > Well, as a newb, I do not how to do AC filament drive so I settled for DC. > Since I will use tube play later on, Would you mind show me some good > resourse explain how to do it? Ｉ appreciate any help! >
There used to be nice single-chip solutions for this, like the TI LM9022 (now obsolete, and the wrong output voltage for the IV-4 or -17). As Pete mentioned, you don't need to do this for small tubes like these. But if you wanted to experiment with other tubes it becomes more important. The linked Noritake document in a previous reply has a good overview of the reasons they always recommend AC drive. There is enough variation in the IV series displays that the normal methods of dealing with a higher-than-desired filament voltage - multiple tubes in series, tubes in parallel with single dropping resistor - may not result in acceptably uniform brightness in a "commercial" product. Even the hobbyist "IV-17 Smartsocket" board used per-tube filament resistors so the relative brightness could be adjusted. -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/44b49147-97b3-4f72-86b1-7124d620efa5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
