Looking at the tube socket (e.g., B7G for 3RP1):
Author: AI Research Desk Date: April 13, 2026 Subject: Embedded Systems / Retro Computing
The beam is always moving. If it fires while moving from the end of "1" to the start of "2", you will see a diagonal retrace line. The Z-axis turns the beam off during these movements. Crt Clock Schematic
Your schematic depends entirely on your CRT type. Most hobbyist schematics use small electrostatic deflection tubes (common in old oscilloscopes) rather than electromagnetic deflection (common in TVs).
Why Electrostatic? Electrostatic deflection requires high voltage (50V–300V) on the plates but very little current. Magnetic deflection requires low voltage but high current and bulky yoke drivers. Most DIY CRT Clock schematics are electrostatic. Looking at the tube socket (e
For electrostatic CRT (like the 3RP1 or 5DEP1):
Without proper linearity correction, your clock digits will appear pin-cushioned or barrel-distorted. Why Electrostatic
In an age dominated by silent, flat-panel displays and voice-activated smart devices, the warm, glowing flicker of a cathode ray tube (CRT) seems like a relic from a bygone era. Yet, for a niche community of engineers, hobbyists, and retro-computing enthusiasts, the CRT remains a medium of fascination. One of the most compelling projects that bridges the gap between obsolete hardware and functional art is the CRT Clock. Examining the schematic of a CRT clock reveals not just a method of telling time, but a masterclass in analog circuit design, high-voltage safety, and the innovative repurposing of electrostatic deflection.
Let’s walk through a complete, proven schematic available on GitHub (search "TinyScope Clock" or "TubeClock V4").