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There is no need for a separate resistor. The resistor which is part of the 3rd inverter is used to connect the buffered output with the input. I though it would be useful with prototyping if you don't have to design a new chip every time, and instead just rearrange the tubes. For example connecting inverters in parallel or series and blocking off some vacuum sources would make NOR and NAND gate chips. I also thought of an implementation of a 4 transistor XOR gate design.
Nice! You dont have to convince to start making these circuits, Im just having some troble getting the tools together. I might try using a laser engraver at my local hackerspace, since I dont have any experience with CNC
Mold Making & Casting Class
I was thinking about how the inverter chip used here could be connected up in different ways to perform different functions, not just as a NOT gate. Here is a D-latch design that could be used to make a shift register. (1st diagram from Figure 8 of https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2917228/ )
Im having trouble finding the right sized tubing that isnt so expensive. Could you pint me in the right direction?
If the logic circuits were made smaller, a compact multi-line braille display could be made https://www.youtube.com/watch?v=0fIg4rI4cDw
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