Thank you for your answer! I'll try that as that makes it possible to use either the 74HCT42 or a pair of 74HCT138s instead of a 74141 with just a few extra transistors and resistors, unless you don't want to use anything more modern like any of the Supertex HV-VFD drivers. Thanks for pointing out the difference between TTL and CMOS in this case.
Would an extra diode in series with the base or lets say a lower voltage on the base work with TTL? If so a simple voltage divider or a zener and resistor to the base would be a simple solution. /Martin On Thursday, 12 March 2015 17:58:55 UTC+1, petehand wrote: > > Yes, it should work perfectly in that application with a CMOS gate. I > would not try it with a TTL gate though, as it relies on the output going > to the 5V rail to turn the transistor off and bipolar can't get up there. > To use TTL you would need to add pullup resistors to 5V on the gate outputs. > > On Wednesday, March 11, 2015 at 1:34:54 AM UTC-7, Dekatron42 wrote: >> >> Pete, will the cascode circuit work properly as a cathode driver if you >> use for instance a 74HCT42 or a 74HCT138 to drive the transistor (they both >> have inverted outputs going low when selected), using the collector of the >> transistor to drive the cathode of a Nixie? >> >> /Martin >> > -- 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/2e2aec34-b035-4500-b639-4437ffaec253%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
