When you think of Nixie tubes, you likely picture a retro-style clock that uses shaped metal cathodes to display numbers. What you may not know, however, is that there is a different type of Nixie tube that doesn’t display numbers (or characters), but can be used as a bar graph by controlling the amount of current entering the device.
Like their numerical cousins, controlling these tubes isn’t as simple as turning on an LED, and requires some extra electronics to get things working correctly. If you would like to experiment with these exotic displays, then this driver board kit includes everything you need to get started, including a pair of IN-9 Nixie bar graph tubes.
All you need to supply is a PWM signal any type of microcontroller, or you could even use analog for control if you so desire. While not connected with this driver, you can see a similar setup in the video below. The kit is from a now-closed (and successful) Kickstarter campaign, which can be viewed here and includes a product video.
