Source: https://www.youtube.com/watch?v=bjAlzA4Cyys

As the legend goes: the 555 timer is the most produced integrated circuit device ever. Why? Because it is simply so versatile. Usagi Electric builds one. But sit down and start to slowly breath through your trousers … He does it using 40's style vacuum tubes! Yes. 

Source: https://spectrum.ieee.org/geek-life/hands-on/build-a-riscv-cpu-from-scratch

Source: https://www.antstream.com/post/the-story-of-nebulus

Source: https://evoniuk.github.io/posts/pitfall.html

Source: https://www.youtube.com/watch?v=wrAgdLYNKJo

Source: https://www.youtube.com/watch?v=ezQjJFd3uMI

A 555 Timer built from Vacuum Tubes

A 555 Timer built from Vacuum Tubes

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.css-xa4zjt{color:var(--chakra-colors-ebn-colors-yellow01);}A 555 Timer built from Vacuum Tubes

A 555 Timer built from Vacuum Tubes

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A 555 Timer built from Vacuum Tubes