Crt Clock Schematic -

Used by most small hobbyist CRTs. It relies on voltage differentials on deflection plates. The circuit uses high-voltage, high-speed transistors (like the MJE340/MJE350 pair) configured as differential operational amplifiers.

The amplifiers must feature a fast slew rate to prevent the drawn vectors from blurring or lagging. High-Voltage Power Supply (HVPS)

Neighbors passed on the balcony below; they would sometimes pause to peer in at the warm glow of the arc, calling up half-joking conjectures about art installations and retrograde hobbyists. They began to bring her small tokens: an old watch with a cracked face, a photograph of a family picnic, a child’s drawing of a sun. Mirroring the schematic’s curious note, the building’s occupants started to speak of "things the clock remembers." A man from the third floor—an archivist by trade—brought a faded postcard stamped 1949, and Mira set it beneath the glass of the CRT. That night the beam drew a perfect little rectangle around the card, then traced a series of geometries that, when she squinted, matched the postcard’s pattern of wear. Crt Clock Schematic

Vacuum tubes are under immense atmospheric pressure. Handle the glass CRT with care; never scratch the glass or put stress on the neck pin connections.

-1000V Rail ---> [ 1M Ohm Resistor ] ---> To Cathode ---> [ 500k Potentiometer ] -> To Focus Grid ---> [ 500k Potentiometer ] -> To Control Grid (Brightness) 4. Z-Axis Blanking Circuit Used by most small hobbyist CRTs

Requires a high-voltage boost converter (12V DC to 300V-500V DC) and faster, high-voltage transistors for the X-Y plates.

-1050V DC (variable relative to the cathode). Focus Grid: -800V DC (variable). The amplifiers must feature a fast slew rate

An ESP32 or STM32 is ideal. Vector generation requires high clock speeds (16MHz minimum) to prevent screen flicker. RTC: DS3231 via I2C interface.

flowchart TD subgraph Power_Supplies["Power Supplies"] PS_HV["High Voltage Supply (e.g., DC-DC Boost)"] PS_HT["Filament & Bias (e.g., 6.3V, ±12V)"] end subgraph Signal_Processing["Signal Processing"] MCU["Microcontroller (e.g., ESP32, PIC16F876) Generates X, Y, Z Signals"] DAC["Digital-to-Analog Converter (Optional, for high precision)"] RTC["Real-Time Clock (e.g., DS3231)"] end