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
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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