[Daniel] sent in his Nixie tube VU meter. It uses 14 Russian IN-13 Nixie bar-graph tubes. He built a custom circuit to amplify, filter, smooth and feed a voltage divider to assign signal levels to ...

This is the senior design project for a group at the University of Vermont. It’s a wet, bubbly, blinky, interactive thing. Each column is a clear tube filled with water, with a string of fully ...