Mini Oscilloscope Clock DG7-6 Cathode Ray Tube 3”
By Andrew Gregory. Posted
![](http://images.ctfassets.net/2lpsze4g694w/55hs8YI9j2L65euV7gAoU8/0370791edaf2a1eccd6a502d1e609333/Screenshot_2021-06-20_at_16.54.42.png?w=800)
CRTs – cathode-ray tubes – are a ridiculous, obsolete technology. They run at a much higher voltage than LEDs – they’re bulky, fragile, and considering their ubiquity in the 1980s, there are relatively few of them around. Still, there’s something evocative about them, so we love this clock. It uses a three-inch CRT display salvaged from an old oscilloscope, brought to new life with an ESP32.