Hi Folks,
First post here. An avid watcher of EEVblog (especially the fundementals) I decided recently to start re-learning electronics (sort of) for the first time in since 2000. I have begun making the obligatory Nixie clock using 4000 series logic, but have run into a wall and would appreciate any help.
I am using a 4060/4013 combo to feed a 1 hz clock pulse into a 4017 counter. I then cascade these together to give me seconds/ tens of seconds, then minutes/ tens of minutes. Both sets of tens, the number 6 output is tied to the reset line to make sure that it counts from 0-59 in both tens and minutes. This works a treat for both the minutes and seconds, but does not quite work with hours due to the need to count to 12/24.
This is where I have become stuck.
I had originally used 2 more 4017s, but it can only count to 20. I was toying with a another counter that would trigger a reset when it counts the 2 output a second time, but this would trigger another carry out. This is all becoming a spiralling mess of counters
Is there any easy way to either count to 12 or 24 and have it ouput the number onto the nixies or am I barking up the wrong tree.
(The nixies are IN-12s with ULN2003A with the +ve rail provided by a 160v boost converter)
I can post a screen of my schematic as it stands if this would help.
Cheers for any suggestions
John