Many years ago I made a 16-tube array using B-7971 tubes. Made my own driver cards for them, one card per tube. Each of those cards has a storage buffer capable of storing the data for its tube. Each card has 15 driver transistors and 15 cathode resistors.
Then I made up a data storage and scrolling circuit for it. Made my own character generator from scratch using an eprom. That eprom takes ascii data and puts it on the address pins, and then the data at any address lights the appropriate tube segments to read out the proper character. If anyone would like any of the particulars of this thing, I'll be happy to share them. I purchased 32 tubes at that time, they were 11 bucks each. Chuck > > >---- Original Message ---- >From: dfor...@dakotacom.net >To: neonixie-l@googlegroups.com >Subject: Re: [neonixie-l] Re: Interested in B7971 >Date: Sun, 22 Jan 2017 08:56:15 -0700 > >>Luka, >> >>Most Nixie tubes only use one cathode at a time, so a single anode >>resistor is sufficient for those types. >> >>The B7971 uses a varying number of cathodes, so an anode resistor >will >>not result in constant cathode current, as its voltage drop is >shared. >> >>Use a resistor per cathode. Lower value resistors for longer >cathodes >>will result in a more even glow. A 20% variation in cathode current >is >>probably not noticeable. >> >> >>On 1/22/2017 4:29 AM, Luka C wrote: >>> I'm actually planning on designing my own PCB for it with exact >current >>> limiting for each segment as per datasheet. Did you do the same or >did >>> you install just one anode resistor and how important is it to >stick to >>> the datasheet in that sense? >>> Dana nedjelja, 22. sijecnja 2017. u 06:13:02 UTC+1, korisnik >gregebert >>> napisao je: >>> >> >> >>-- >>David Forbes, Tucson AZ >> >>-- >>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/96aaf58b-6dfb-7cd5-00f6- >03aad1ba84b8%40dakotacom.net. >>For more options, visit https://groups.google.com/d/optout. >> $4.95/mo. National Dialup, Anti-Spam, Anti-Virus, 5mb personal web space. 5x faster dialup for only $9.95/mo. No contracts, No fees, No Kidding! See http://www.All2Easy.net for more details! -- 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/380-22017102220540140%40all2easy.net. For more options, visit https://groups.google.com/d/optout.
