13 December
This year, artist Tue Greenfort found shelter at a biennial in the far north.
Crt Clock Schematic __top__ May 2026
The CRT (Cathode Ray Tube) clock, particularly when built from scratch using vintage components, is a profound intersection of mid-century aesthetics, analog vacuum tube electronics, and modern digital logic. Unlike modern liquid crystal displays (LCDs) that offer a perfect, static image, a CRT clock schematic represents a dynamic, fragile, and artistic endeavor to make time visible through electron bombardment of phosphor. The Heartbeat of the Machine: Schematic Components
Overview
Next Steps:
For a complete, ready-to-print PDF schematic, please ensure you adhere to local electrical codes. When in doubt, use an oscilloscope transformer (isolation type) for your mains input. Crt Clock Schematic
- All HV components must be potted in epoxy or enclosed in an acrylic cage.
- Bleeder resistors (10MΩ) must be soldered across the HV capacitor to discharge the tube within 10 seconds of power-off.
- Read Hours (H), Minutes (M), Seconds (S) from DS3231 RTC.
- Convert digits to segment coordinates (stored in PROGMEM array).
- Send X/Y coordinates to DACs at 50kHz.
- Draw a circle for the dial (requires sine/cosine lookup table).
// Draw Circle (60 points)
for (int i = 0; i < 60; i++)
float rad = i * 6 * DEG_TO_RAD;
points[i] = sin(rad)*0.8, cos(rad)*0.8, Z_ON;
Conclusion
The CRT Clock Schematic is a beautiful blend of analog physics and digital control. While daunting, building one is the ultimate testament to an engineer’s skill. You are not just programming a display; you are steering electrons through a vacuum at relativistic speeds to paint time itself. The CRT (Cathode Ray Tube) clock, particularly when
