Crt Clock Schematic

When moving the beam from the end of the minute hand to the start of the second hand, the Z-axis must be turned off before the DAC changes value. A 1µs delay is required; otherwise, "flyback lines" (ghost diagonal streaks) will appear across the screen.

Safety warning: The HV section stores lethal charge even when unplugged. Always discharge through a 10MΩ resistor.

Looking at the tube socket (e.g., B7G for 3RP1): Crt Clock Schematic

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.

The final anode voltage (post-focus) is lethal. When moving the beam from the end of

Most reliable schematics use the following chain:

Critical Component: Look for the STK392-110 or STK392-150 hybrid IC in old schematics. These are 3-channel deflection amplifiers from rear-projection TVs. They are perfect for CRT clocks (2 channels for X, 1 for Z blanking). Critical Component: Look for the STK392-110 or STK392-150

The cathode must be heated to ~800°C to emit electrons.

Intensity Driver (Z-axis): A fast op-amp (e.g., LM6172) drives the grid voltage.