For the following reasons: 1. High voltage swing PWM, I am afraid it will cause EMI interference.
2. As far as I know, the impedance has a sharp change during the lighting moment. (As arc discharge?) PWM driving may mean more heat generation, more aging and wear? I'm not sure. 3. If you want to completely avoid audible noise, the PWM frequency should be raised above 30khz. (Not only tube, also coil.) Considering that is voltage >150v , the stray capacitance effect will become significant, and there may be reliability and safety hazards. And also, I'm not sure Nixie tubes are responsive enough. About these reasons. (I'm not sure if my concerns are correct.) Christian Riise Wagner 在 2023年1月15日 星期日凌晨12:53:18 [UTC+8] 的信中寫道： > Out of curiosity, why doesn't PWM sound like a good idea? There isn't > really an alternative, other than lowering the current, which you don't > seem too fond of either. I'd say PWM is the easier method. Just choose a > sufficiently high frequency to avoid noticeable flickering. Note that the > ammeter averages out readings, so whether the tube is driven at a constant > reduced current or PWM, the reading will be lower, even though PWM is full > current delivered in pulses. > lørdag den 14. januar 2023 kl. 14.14.52 UTC+1 skrev overdoingism Lab.: > >> My nixie clock has a switch, with three level, full - low - off. >> >> The low level setting does make the tube look a bit dimmer. >> >> And the current seems to be slightly below specification. >> >> For all I know, it's probably not good for "Cathode Poison", but I can >> switch back to full level to flush them. >> >> Besides, is there any disadvantage? >> >> BTW, Is there any way to adjust the brightness? PWM doesn't seem like a >> good idea. >> > -- 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/296e28e6-6943-4f8b-9709-0aae707b1009n%40googlegroups.com.
