Nixie Clock

[Aztlanpz]

Will this work?

[skillz21]

Try this:

[Aztlanpz]

Anyone know if my design is functional?


Thank you
 

[Rbastler]

No, you'll need pulldown resistors fro the base of the transistors.
Early designs of my nixie clock didn't have them and therefore the other segments where glowing slightly, while not active.

[Aztlanpz]

what value does the pull down resistor be.


Thank you

[NivagSwerdna]

Anyone know if my design is functional?

I think it would probably work but I wouldn't necessarily advise it.  (There are lots of MPSA42 designs for cathode drivers that look a bit like yours).
If you haven't already read... https://threeneurons.wordpress.com/nixie-power-supply/ ... read the bit about off-segment glow.
Depending on the size of your tubes you might like a design that keeps your on element at ground but your floating elements around 60V.
Personally I like HV5812 (and similar) drivers or you could get K155ID1 from ebay... or use Dave's approach... lots of options.

What nixies do you have?

[Aztlanpz]

I have the IN-14 nixies

[Rbastler]

what value does the pull down resistor be.


Thank you

I used 15kOhm. But the final design has russian SN74141. I found a russian ebay seller, that sells the quite cheap. Using them makes everything easier and more compact.

[NivagSwerdna]

I have the IN-14 nixies

Nice 

Might be worth looking at http://www.pvelectronics.co.uk/ the kits available there are documented in the assembly instructions complete with schematics... might give you a few ideas and if you decide to opt for a Pete kit he is always super helpful. (I have no commercial connection with pvelectronics but have had tube buying advice from Pete before)