Crt Clock Schematic [verified] Page

: Most hobbyist schematics utilize small, 1-to-3 inch oscilloscope CRTs (like the DG7-6 or 5LO38I ) because they use electrostatic deflection , which is easier to drive with simple circuitry than the magnetic deflection used in old TVs.

Note: Old TV tubes require 15kV. Do not use TV tubes for desk clocks. Crt Clock Schematic

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). : Most hobbyist schematics utilize small, 1-to-3 inch

: These circuits control the horizontal (X) and vertical (Y) plates of the CRT. Schematics often use dedicated tubes like the EF80 or high-voltage transistors (like the STP2NK90Z ) to amplify low-voltage signals into the hundreds of volts needed to move the electron beam. Look for the STK392-110 or STK392-150 hybrid IC

Eventually, the schematic yielded another clue: a list of coordinates in a margin, almost as if the original builder had tucked a map into the diagram. Mira, practical always, followed them in the light of a brisk Sunday. They led to an abandoned workshop across town—once a place where luminous instruments had been forged and tuned—and there she found a small chest with more sketches, a bundle of letters tied with twine, and a photograph of an old man with steady hands, smiling as if he had just mounted the world on a plate. In his handwriting, on a scrap of paper, were the words Mira had most wanted to find: "Clocks that remember are less dangerous than clocks that forget."

Many beginners try to run a CRT clock directly from Arduino PWM pins. It looks terrible. You need:

: Small vacuum tubes (like the EF80) or specialized transistors amplify the microcontroller's signals to a level high enough to move the electron beam. How the Schematic Works