Probably IR would work better as normal glass and borosilicate are opaque to UV light. In the normal case, the UV LEDs emit near-UV so they have a reasonable content of blue /violet light to pass through the nixie walls and help ionization. IIRC some sleepy Nixies took several seconds to trigger and light in complete darkness. Natural beta and gamma rays help too, and that is the reason to put Kr-85 into some of them that needed certain operation. Regarding to the incomplete lighting of the digit, it is a totally unrelated issue, that has to do with low anode voltage.
On Friday, November 6, 2020 at 4:03:51 PM UTC-3 [email protected] wrote: > I had the same issues with ignition delays of B5870, but only in complete > darkness and not all the times. It would present itself only if dark and > the tube had been off for a while, if dark but the nixie had just been on a > few seconds to a minute before, than no issue. After a brief search online, > I guessed that it must have been a small issue with ionisation and I read > that some people add a small UV LED to help with that. I opted for > background blue LEDs. After adding the LEDs, I realised that the top of > digit 2 and 5 wouldn't completely ignite when both decimal points on the > digit where on. I increased the voltage of the power supply so slightly by > changing the bottom resistor of the resistive divider to compensate for the > voltage drop from the LEDs (added in series on the anode of the nixie) and > it works perfectly now. Perhaps slightly different issue than yours but the > idea of adding a small UV LED may be worth thinking about (I wonder whether > an infrared LED hidden somewhere works as well). > > Il giorno giovedì 29 ottobre 2020 alle 15:41:07 UTC newxito ha scritto: > >> It’s direct drive, 5 x HV5622. >> According to the datasheet, for 200V the resistor should be 18k. I don’t >> want to change the 14 anode resistors because I don’t want to play around >> the tubes with the hot air gun if not absolutely necessary. >> I can try to increment the voltage to 175V, I think that should be still >> ok with the used 8.2k resistors. >> >> >> >>> When and why did we all settle on 170V? >>> >> Good question.. not my fault, I only started playing with nixies 4 years >> ago :-) >> >> >> > -- 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/16dd37c1-e0c2-4600-88ca-210cc2e90033n%40googlegroups.com.
