I uploaded a picture in case anyone is interested in it: http://imageshack.us/photo/my-images/825/sn74142.jpg/
Also, to answer Adam's question on where I was lucky enough to find them, it was Ralph's Industrial Electronic Supplies on the web. Unfortunately, they didn't have any additional stock or source for more. On Sat, Feb 25, 2012 at 6:25 PM, chuck richards <[email protected]>wrote: > Ahh, I agree with David on this one. > Lucky. I have been working with this stuff since > around 1990, and during that time have only ever found > a small bunch of (10) of those 74142 ics. They are > extremely rare, made of pure unobtainium! > > They are the equivalent of a decade counter connected to > a 74141 and all in one 16-pin DIP package. > > TTL cookbook page 93 describes it. > > Some notes from last time I had mine fired up: > > Counter clear pin 1 is very sensitive to noise. > If using a 2.2k pullup resistor, a .01 uf or a .1 uF > to gnd. keeps the full count going. Without the cap, > the count goes 0 1 2 3 4 5 0 > > Carry out pin 14 stays high for all counts except 8 and 9. > Carry is low for counts 8 and 9, and it returns high when > count 0 is reached. > > 74142 belongs in a glass case, temperature and humidity > controlled, low light, nitrogen atmosphere. > > Chuck > > > > > > > > >---- Original Message ---- > >From: [email protected] > >To: [email protected] > >Subject: Re: [neonixie-l] Question on SN74142s > >Date: Thu, 23 Feb 2012 21:15:54 -0800 > > > >>They're also covered in the TTL Cookbook (That's where I found out > >about > >>them)... Where did you find them?!? > >> > >>-Adam > >> > >>On Thu, Feb 23, 2012 at 6:44 PM, David Forbes > ><[email protected]> wrote: > >> > >>> On 2/23/12 7:11 PM, Dylan Distasio wrote: > >>> > >>>> Hi all- > >>>> > >>>> I recently picked up 2 SN74142 ICs. I'm about to show my > >ignorance > >>>> again, but can someone with some patience walk me through how I > >would > >>>> use these in a nixie clock. I'm familiar with the 74141s but > >have to > >>>> admit after reading the SN74142 datasheet I am not entirely sure > >how > >>>> this one works. I am still a beginner at digital logic, and > >would > >>>> appreciate any help with utlizing a combo of a decimal counter / > >4-bit > >>>> latch /decimal decoder/ nixie driver in one IC. > >>>> Datasheet http://diogenes.iwt.uni-**bremen.de/vt/laser/nixie/** > >>>> > >SN74142.pdf<http://diogenes.iwt.uni-bremen.de/vt/laser/nixie/SN74142. > >pdf> > >>>> Best, > >>>> Dylan > >>>> > >>>> > >>> Dylan, > >>> > >>> Lucky man! I've never seen one of those chips in person. > >>> > >>> I have used the old CMOS more-or-less equivalent, the CD4033 > >(which drives > >>> 7-segment LEDs) to make a clock. You will need to wire the latch > >in > >>> transparent mode, as the latch function is not needed for a clock. > >>> > >>> RCA published an app note in their 1974 data book that I built in > >1976. It > >>> worked. I'll see if my scanner will cooperate enough to scan the > >app note. > >>> > >>> -- > >>> David Forbes, Tucson AZ > >>> > >>> > >>> -- > >>> You received this message because you are subscribed to the Google > >Groups > >>> "neonixie-l" group. > >>> To post to this group, send an email to > >[email protected]. > >>> To unsubscribe from this group, send email to > >neonixie-l+unsubscribe@** > >>> googlegroups.com <neonixie-l%[email protected]>. > >>> For more options, visit this group at http://groups.google.com/** > >>> > >group/neonixie-l?hl=en-GB<http://groups.google.com/group/neonixie-l?h > >l=en-GB> > >>> . > >>> > >>> > >> > >>-- > >>You received this message because you are subscribed to the Google > >Groups "neonixie-l" group. > >>To post to this group, send an email to [email protected]. > >>To unsubscribe from this group, send email to > >[email protected]. > >>For more options, visit this group at http://groups.google.com/group > >/neonixie-l?hl=en-GB. > >> > >> > > > > $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 post to this group, send an email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
