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.
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