Schematic | Crt Clock

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 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.

A dedicated digital pin from the MCU connects to a high-speed transistor to turn the electron beam on and off. This prevents "retrace lines" from showing when the beam jumps from the end of one digit to the start of the next. Section B: Deflection Amplifiers (X and Y Drive)

+5V +12V | | [MCU] [555]--[Flyback]---> +HV to CRT Anode | | I2C GND [RTC] | [DAC]---[X-Amp]---(X plate left) (X plate right) [DAC]---[Y-Amp]---(Y plate bottom) (Y plate top) Crt Clock Schematic

Electrostatic deflection requires push-pull driving. When one plate goes positive, the opposing plate must go negative to maintain beam focus.

The CRT is the display itself, and selecting the right one is the first critical decision. Commonly used small, electrostatic tubes include models like the , 5LO38I , and 2BP1 . The choice of tube dictates requirements for the other subsystems, such as the heater voltage (often 6.3V), anode voltage (which can range from a few hundred to over 10,000V), and deflection plate sensitivity .

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The schematic features high-voltage operational amplifiers or discrete transistor pairs (often using video display transistors like the MJE340). These amplifiers scale the 0–5V DAC signal up to a differential swing of across the internal deflection plates.

yeah I think we're think we're down some voltage there or something pretty blurry definitely better so we'll stick with this. too. YouTube·CREEKVIEW ACRES

: Small vacuum tubes (like the EF80) or high-voltage transistors (like the : Most hobbyist schematics utilize small, 1-to-3 inch

CRTs are highly sensitive to ripple voltages. High-voltage ripples cause wavy lines on the clock display. Ensure your schematic features robust filtering capacitors (rated for appropriate high voltages, e.g., 400V to 2kV) and bleeder resistors to discharge the capacitors safely when powered down. 4. Critical Safety and Calibration Guidelines

If the electron beam is always on, the CRT will display messy "retrace lines" as the beam moves from the end of one digit to the start of the next. The Z-axis circuit acts as a high-speed switch connected to Grid 1 (G1) of the CRT.

In the age of smartwatches and digital displays, the Cathode Ray Tube (CRT) clock stands as a mesmerizing intersection of retro technology and modern engineering. A CRT clock isn’t just a timekeeping device; it is a functioning piece of electronic art that brings the vintage glow of oscilloscopes into the digital age.

Converts the MCU's digital coordinate points into low-voltage analog waveforms.

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