Ghost Dance

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Ghost Dance

edo1123
Hi guys. Just found this pic on Tim Escobedo siite. image423.png
I'm interested in the second part , where he talks about the "proximity control". How can I build one with a cd4049 or cd4069 (I think I could use one of them to build the entire circuit)? I saw something made with cd4093 but this one seems simpler and easier to build.