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 chuc...@all2easy.netwrote:
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: a...@jacobs.us
To: neonixie-l@googlegroups.com
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
dfor...@dakotacom.net 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.pdfhttp://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
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