|IN-12A Nixie tubes... You can still see a "CCCP" logo. Gotta love old Soviet surplus.|
Those things are pretty cool: they're the ancestors of the modern 7-digit display, and they give a nice and warm light! People now build blocks out of those, I just wanted to see what they're like, and maybe use them for something else one day (who nows, maybe another watch?).
So I bought four IN-12A off eBay, and built a small power supply for them.
I just wanted to light them up, nothing using a complex microcontroller control...
|The power supply. I uses 5V AC, and turns it into 180V.|
|Inside view. Nothing really complicated, just a backwards wired transformer, capacitor, along with a few other things.|
|The schematic... As I said, I wanted something quick and easy to build :)|
|I just love that sweet glow!|
|Nixie tube tester... The switch you can see on the left side of the box selects the different digits... Because it's a 5-pos, I had to use another switch to toggle between digit 1-5 and 6-0.|