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Circuit arrangement and construction

A project log for Vacuum tube single digit calculator

Forget that newfangled silicon. Hollow state is king!

castvee8castvee8 04/24/2019 at 01:300 Comments

The vacuum tubes are arranged in four packs on 3 D printed sheets. This allows easier wiring and assures short wire jumpers. The 6 volt filaments are series in two and fed with 11 volt filament voltage to slightly reduce heat and increase longevity.

A bias, b+ filament and control wires are connecterized to each of the panels to allow easy removal of a whole sheet for repairs, inspection, replacement etc.

The neon displays are created by 3 D printing a frame and carefully laying each NE-2 bulb into the frame and securing. A dropping resistor is added to each and the connector carries the wiring into the CPU. The tube frames are mounted horizontally to reduce space and greatly compacts the design.

This shows the back rectifier and regulator. Breadboard was used to make busses and tie points.

If in fact you are able to master more than single digit math this platform is expandable to infinity. Add more tube frames, add more display digits and you will appear to be a math wizard or some such. This basic design was produced as proof of concept for the CPU architecture and therefore minimized to stop the insanity of adding more components to an already bloated design. Still fun....and state of the art if you are in the 1950s.

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