Finally getting back to this after more boring bits of life, and finishing a couple of nixie clocks I was working on. Back to FLW = Back to asking questions - this time about resistor values.
* As before, I'm experimenting with cathode drivers - and came across this blog post<http://lucsmall.com/2011/07/19/using-the-sn75468-as-a-nixie-tube-driver/>which explains it (via some help from this group). I also tried it with the 50v ULN2003A and a 47v Zener diode and it works - this is good news since they are cheaper and more readily available. I'm not quite sure how to calculate the pullup resistor, but it doesn't seem too critical. * However, given that I know from the spec sheets what current should be going through each cathode, I can't quite get my head around what voltage differential I should be using to calculate the cathode resistors...? * Similarly, I just discovered that unlike LEDs, nixie circuits seem to use an anode resistor as well as cathode resistors - why is this? The spec sheets of the tubes show the anode current - but as above, I'm not sure what voltage difference I should be using to calculate this. * Also been experimenting with anode drivers; I was going to use an optoisolator, but I'm trying to make a design which will drive both the nixies and LEDs (with appropriate changes in supply voltage and resistors), and it turns out I can't get one to handle the current of the LEDs. So I'm probably back to the common MPSA92/42 combination. I see lots of schematics including these, but I'm not quite getting the logic of how the resistors are calculated... As ever, any insight hugely appreciated... -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/tNXu8njM8EoJ. For more options, visit https://groups.google.com/groups/opt_out.
