: Converts low voltage (often 12V DC) to the 300V–550V required to power the tube and its deflection plates.
A fast op-amp (e.g., LM6172) drives the grid voltage. Crt Clock Schematic
Since there is no framebuffer, letters (H, M, S, AM/PM) are drawn using . The ROM stores sequences: : Converts low voltage (often 12V DC) to
Two 10-bit or 12-bit DACs (e.g., MCP4922) are used—one for the horizontal axis ( ) and one for the vertical axis ( B. Deflection Amplifiers The ROM stores sequences: Two 10-bit or 12-bit DACs (e
The schematic typically shows a differential amplifier configuration. For the X-axis (horizontal), the amplifier scales the 0-5V logic signal to, say, -50V to +50V. For the Y-axis (vertical), a similar circuit handles the drawing of the digits. A well-designed schematic will include . When the beam moves from the end of one digit to the start of the next, it must be turned off (blanked) to prevent drawing ugly retrace lines across the clock face. This blanking signal is fed to the control grid (typically pin 2 or 3 on the CRT) via a fast switching transistor.