Thanks, I will try it but I am currently renovating my whole apartment, including my hobby room, so that will be many months into the future but it is on my list - maybe I can't keep from checking it before I have finished renovating, you know how it is when your fingers itch to do something you really want to do instead of what you should be doing.... ;)
/Martin On Friday, 13 March 2015 09:30:30 UTC+1, petehand wrote: > A lower voltage on the base would work, or an extra diode in series with > the EMITTER to raise the turnon voltage by another 0.6V, or just pullup > resistors on the chip outputs to make sure they go to a righteous 5V. > Remember you still need those emitter resistors, otherwise the B-E diode > will short the driver output to Vcc and cook it. It may be worthwhile to > use those resistors to set the cathode current, since they have to be there > anyway, and not use an anode resistor. I don't know, I've not tried it > myself, so you're a pioneer. Be sure and tell us how it works out. > > On Thursday, March 12, 2015 at 10:18:22 AM UTC-7, Dekatron42 wrote: >> >> 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/bf104a26-ff3d-4c62-9f50-f706bc3acc2a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
