Build a CRT Calculator

The CRT calculator project is a fascinating blend of retro computing and modern engineering. This open-source initiative brings together enthusiasts who want to understand how vintage cathode ray tube displays work while building functional calculating devices from scratch.

At its core, the project demonstrates the principles behind early computing technology. Rather than relying on modern LCD or LED displays, builders use actual CRT screens—the same technology that powered televisions and computer monitors for decades. This hands-on approach offers valuable insights into analog electronics, signal processing, and the clever engineering solutions that made compact computing possible before the digital revolution.

What makes this project particularly engaging is its educational value. Participants learn about oscilloscope fundamentals, vector graphics rendering on CRT displays, and the mathematical operations required to drive these vintage screens. The calculator itself performs standard arithmetic functions, but the real achievement lies in the custom circuitry and software needed to display results on a CRT in real time.

The community surrounding the CRT calculator project is active and welcoming. Builders share schematics, troubleshooting tips, and creative modifications. Whether you're interested in electronics restoration, retro computing, or simply want to understand how technology worked before the microchip era, this project offers a compelling entry point.

For anyone considering building their own CRT calculator, the project documentation provides detailed guidance. You'll need basic soldering skills, access to vintage or surplus CRT components, and patience for debugging analog circuits. The result is a working piece of computing history that you've built with your own hands—a deeply satisfying achievement for makers and tech enthusiasts alike.

And to keep up to date with new products, news, tutorials and more here at PMD Way - we're on x, Facebook, Instagram, threads, reddit, and instructables.