Crt Clock Schematic Instant

: 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.

Keep the high-voltage generation entirely separate from the low-voltage logic side. Use optocouplers for the Z-axis blanking signal to protect your microcontroller and programming computer from high-voltage spikes. Crt Clock Schematic

If the MCU crashes and stops updating the DACs, the electron beam will stop moving and park on a single spot. Within seconds, this concentrated beam will permanently burn a dark spot into the screen's phosphor coating. Implement a hardware "watchdog" or a hardware capacitive coupling circuit on the deflection lines; if oscillation stops, the circuit should automatically pull the Z-axis low to blank the beam. If you are planning to build your own unit, let me know: Which specific CRT tube model do you intend to use? : These circuits control the horizontal (X) and

For hobbyist use, enclose the design in an acrylic case with a grounding mesh. Use optocouplers for the Z-axis blanking signal to

Typically an ESP32, STM32, or ATmega328P. It calculates the geometric coordinates needed to draw the clock face.

The CRT requires high voltages to accelerate the electron beam. The HV supply is the most critical subsystem. It must generate the (often 300-400V for smaller tubes, but up to 30kV for others). This is typically achieved using a flyback transformer (common in televisions) or a voltage multiplier circuit. A straightforward approach uses a 12V to 300V DC-DC step-up converter module to generate the necessary plate voltage for smaller tubes. This is a much simpler method than building a tube-based high-voltage supply from scratch.