Well I know that saw a reference to some old RCA data sheet application note regarding the unobtainium 74142 chip. It's ok fine with me if that never turns up because I have figured out how to work with these 74142 chips to effectively shorten their counts for 10's of seconds, 10's of minutes, 10's of hours counters on a clock. However, if such application note does actually exist and can be found, it might shed some light on alternate methods used to manage the count-shortening on these 74142 decade counter/nixie driver ICs. I am currently scrounging around everywhere for any and all information I can find about 74142. Thanks everyone for your help and responses so far!
On Tuesday, January 7, 2025 at 3:09:10 PM UTC-5 J Forbes wrote: > Reading David's post from 2012, my understanding is that he built a CMOS > nixie clock in 1976, using 4033 chips, and the schematic in the 1974 RCA > databook. That databook covers CMOS and Linear chips, not TTL. > > So, I think you're chasing a ghost, caused by a slight misunderstanding. > > > On Tuesday, January 7, 2025 at 12:14:04 PM UTC-7 Leroy Jones wrote: > >> Yes, thank you gentlemen for the responses to my inquiry regarding the >> rare and esoteric 74142 decade counter/nixie driver IC. >> I have successfully built a fully operational clock using them. It was >> not easy nor practical. But it works. This clock uses (17) ICs. >> I am seeking the supposed ancient RCA application note which reportedly >> describes a clock design that utilizes these 74142 ICs. >> The very existence of this app. note is in and of itself somewhat of an >> urban legend. Am I chasing a ghost here? >> >> But many will ask "why bother doing it?"..............To which I >> answer: "because it's cool" >> >> >> >> >> On Tuesday, January 7, 2025 at 11:41:04 AM UTC-5 gregebert wrote: >> >>> There was a T4142 TTL IC that has a binary counter and nixie driver in >>> one device; the Texas Instruments datasheet was published in 1972. Good >>> luck finding these devices; I've seen a few for sale online and I'm certain >>> very few were manufactured because LED displays quickly killed-off nixies >>> around that time. >>> >>> There is a short thread on neonixie from 2012: >>> https://groups.google.com/g/neonixie-l/c/R7K9eJcP8h0 >>> >>> >>> On Monday, January 6, 2025 at 5:00:49 PM UTC-8 J Forbes wrote: >>> >>>> There's the TI applications for the 74141 driver and 7490/92 counter, >>>> but that's probably not what you want. >>>> >>>> http://selectric.org/nixie/ticlock.gif >>>> >>>> >>>> >>>> On Monday, January 6, 2025 at 4:53:36 PM UTC-7 Leroy Jones wrote: >>>> >>>>> Does anyone here remember ever seeing any application notes about >>>>> making a nixie tube clock based around the 74142 counter/driver IC? I >>>>> seem to recall a post made many years ago by David Forbes where he >>>>> referred >>>>> to an old RCA application note about this. >>>>> >>>>> Any info will be greatly appreciated. >>>>> >>>>> Chuck >>>>> >>>> -- 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 [email protected]. To view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/05c5a9ad-2737-4ffa-a37e-7b138e35c3c3n%40googlegroups.com.
