When people refer to “Scott’s Nixie Tube Clock,” they are generally referring to the unique engineering projects designed by Dr. Scott M. Baker, a well-known engineer and vintage computing enthusiast. Over the years, Dr. Baker has built a reputation for designing highly creative, open-source, custom Nixie tube clocks and calculator boards that bridge ancient computing hardware with modern control technology.
Dr. Baker’s notable variations of the Nixie clock showcase distinct design styles and hardware integration: 1. The Multibus Microcomputer Nixie Clock
Dr. Baker designed a dedicated add-on board to transform a vintage, industrial Intel-powered Multibus microcomputer into a massive, functioning Nixie clock.
The Tubes: It uses up to eight IN-12 Nixie tubes (vintage Soviet-era cold-cathode displays).
The Power: It features a built-in custom 170-volt DC power supply required to ionize the low-pressure neon gas inside the tubes.
Timekeeping: It gives builders a choice between a period-appropriate real-time clock (RTC) module or a modern Global Navigation Satellite System (GNSS/GPS) receiver module for ultra-precise timekeeping. 2. The Talking Z80 Retrocomputing Clock
Another prominent iteration is his Z80-microprocessor-driven Nixie clock.
Audio Synthesis: It features an SP0256A-AL2 speech synthesizer chip that physically “announces” the current time aloud when a front panel button is pressed.
Self-Setting: It utilizes a UP501 GPS module to automatically adjust and maintain accurate time without requiring manual user input. 3. Propeller and Raspberry Pi Implementations
For easier standalone replication, Dr. Baker also open-sourced more accessible variants on his personal engineering blog and GitHub repository:
Propeller Clock: Uses an 8-core Parallax Propeller microcontroller paired with a Dallas 1302 RTC chip to drive a set of IN-12 tubes.
Raspberry Pi Prototype: A custom-designed PCB prototype that allows a low number of Raspberry Pi GPIO pins to control a high number of high-voltage Nixie pins without traditional matrix multiplexing. Core Features of Dr. Baker’s Designs
Across most of his builds, Scott focuses on distinct engineering principles:
Anti-Cathode Poisoning: Software routines that periodically scramble or cycles the digits (0-9) to prevent a phenomenon known as “cathode poisoning,” where inactive numbers degrade from internal metal sputtering.
Extreme Hackability: He actively shares his Python scripts, schematics, and code so other retro-hardware hobbyists can modify the boards.
Are you looking to replicate one of Dr. Baker’s open-source builds yourself, or were you trying to locate pre-assembled vintage Nixie clocks to purchase?
Z80 Retrocomputing 12 – Talking Nixie Tube Clock – Dr. Scott M. Baker
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