-50V to -150V DC. Controls brightness and blanking.
The Z-axis circuit controls the voltage on the CRT’s Control Grid (G1).
Find a proven "Scope Clock" schematic (e.g., on JFET.org ). Crt Clock Schematic
11 Oct 2025 — 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
Bringing G1 deeply negative relative to the cathode completely stops electron flow, blanking the beam instantly. ⚠️ Critical Safety and Design Tips -50V to -150V DC
Steers the beam directly to draw lines and curves (like an oscilloscope). This is the preferred method for CRT clocks because it yields crisp, glowing geometric fonts. 📉 3. Digital-to-Analog Conversion (DAC)
Always place a high-value resistor (e.g., 1MΩ to 4.7MΩ, rated for high voltage) across every high-voltage filter capacitor to automatically discharge the circuit when turned off. Find a proven "Scope Clock" schematic (e
Moves the beam up and down.
A typical CRT clock schematic will show the following circuit blocks:
To convert digital coordinates from the MCU into physical steering voltages, you need two high-speed DAC channels. DAC Requirements
An (often referred to as a CRT clock ) is an electronic device that uses a Cathode Ray Tube to display time by manipulating an electron beam in XY mode . Modern versions typically use a microcontroller (like an ESP32 or PIC ) to generate the necessary waveforms, replacing the complex analog circuits of the past. Core Circuit Modules