A CRT clock (or "Scope Clock") uses a Cathode Ray Tube—typically from a vintage oscilloscope—to display time in either analog or digital formats
A standard schematic breaks down into four distinct subsystems:
The CRT clock schematic is an exercise in hybrid analog-digital design. While modern TFT displays are simpler, the CRT's glowing green phosphor and analog vector movement provide a unique aesthetic. The critical challenges are designing a high-voltage, high-speed deflection amplifier and correctly timing the Z-axis blanking. The resulting device acts as a fully functional clock and an oscilloscope-like display for vector graphics.
Based on a typical electrostatic CRT clock schematic (e.g., "SNTP-CRT" by David Forbes), here is what you need:
