Nixie clock

[manubali]

Hi, i am a beginner learning to design circuits, recently i got inspired by dave's nixie tubes project and decided to build one, i have choosen this circuit https://www.instructables.com/id/SMD-Nixie-Clock/
Author have used IN-14 nixies for this project, but they are bit expensive, i found IN-12a and NL-841, (nzd $26 and $90) for Lot of 6,  and i am going for NL-841, but i have confusion with pin configuration.
The 14th pin in datasheet is called "int. conn." What does that means?? I know its a stupid question.

[danadak]

Have you got a datasheet you can post ?

Just speculating that this is a pin used internally as a header and has "int"-ernal
connections to it. Not to be used by user ? Just a thought.


Regards, Dana.

[manubali]

https://www.google.co.nz/url?sa=t&source=web&rct=j&url=http://www.tube-tester.com/sites/nixie/dat_arch/NE-data_03.pdf&ved=0ahUKEwjNhJ3iz6bUAhULO7wKHTdLBqQQFggbMAA&usg=AFQjCNFqPUXkSfA2rLThPrNkmGIvl5mLUA&sig2=vW7ZJCK3818PwYo-dntanA

Check page 5 for NL-841 pin configuration

[james_s]

Pins with names like that are frequently used as mechanical supports for the internal structure of the tube. Often they're effectively in parallel with other connections, occasionally they're used to power a coil wrapped around a getter pill. Whatever the case you should avoid connecting anything to them unless you know for sure what you're doing.