Here's a little nixie project. Its a thermometer, it has a 2-1/2 digit 
display, with a simple NE-2 in the 1xx position. I decide to build a 
decrete dual slope ADC circuit, to convert the temp voltage from a LM34 to 
a digital readout. Since a dual slope converter has a rising and falling 
ramp (with a steady DC input), it just begged to have a IN-13 bargraph 
following that signal.

<https://threeneurons.files.wordpress.com/2015/02/ntherm01s.jpg>

Here a video:

http://www.dailymotion.com/video/x2i8c95_nixie-thermometer_tech

And more details:

https://threeneurons.wordpress.com/nixie-power-supply/nixie-thermometer/
Enjoy !

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