I would recommend using design like first one from link below: I haven't tested it myself, but it looks like it loses less power (doesn't have any resistors going from 200V to GND), and the mentioned minimum voltage drop on it will be not noticable in nixie application. It is not really a current source, but a current limiter, but again - it should do it's job. It uses one more transistor, but I think that with MMBTA42 or MPSA42 prices it shouldn't matter much. http://electronicdesign.com/power/current-limiter-offers-circuit-protection-low-voltage-drop
W dniu sobota, 25 marca 2017 04:26:32 UTC+1 użytkownik Paul Andrews napisał: > > I wanted to start a discussion about constant current sources (as opposed > to sinks, because I want to provide a constant current to the anode > regardless of which cathode is pulled to ground). I've found many articles > on the web. Some for Nixie constant current sinks, some for LED constant > current sources, some more theoretical, some very simple, some very > complex. But no constant current *sources *for Nixies - i.e. designs for > a constant current source that include actual part numbers and component > values. I wanted to start simple, to make sure I have at least some grasp > of this topic, so here is my first stab. I would be grateful if anyone > could let me know if it would work as is or if I have made some fundamental > errors - ignoring improvements such as temperature stability for now (BTW > R3 is Re in the equations). > > Be gentle - this is all new to me! > > > <https://lh3.googleusercontent.com/-6_6C5llpeLk/WNXifCYtvXI/AAAAAAAAAg8/oXiVHkDrr8YlvZAji94FgfB9zsarvo-xgCLcB/s1600/CCS.jpg> > > -- 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/b8455dc3-4668-403f-bf86-92ed3c917723%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
