I want to build a four digit VFD clock (three of them actually) without using drivers like the max6921. I have two possibilities at this moment, one is this http://i.imgur.com/D4FGaV1.jpg and the other being this one http://i.imgur.com/5fMc7ty.png . Which would be best?
Another question is the resistor that I will need: 0.0035/25*3 = 0.00042 60/0.00042 = 140k = 130K or 150K ohm for R1 and 100k for R2 For the grids the same circuit applies but with a slightly different value for R1 due to the different current. But this implies that I use 60 volt. A few people said that the tubes are very bright at the recommended 50-70 volt for multiplexed tubes so if I lower the voltage to 40 volts I would suddenly need only 100K for R1. Will I bump into problems if I lower the voltage to lets say 40 volts but when my resistors are calculated for 60 volt? I want to make the filament supply with a 7806 and wires them in series, AC will be generated by four bs170 mosfets. Do I still need a filament resistor if I match my voltages this exact? Suggestions are welcome, my PCB can be roughly 9 by 5 cm so maybe there are other (cheap) alternatives to using resistors as drivers? I first got this idea because everything had to be stuffed onto a smaller pcb so maybe now that I have more space I can now use some IC's instead? -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/62997dbb-f1ac-4b11-8e24-42f3eec74ad6%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
