Almost OT: Pushbutton switch latching

Lee Davison lee at
Sat Dec 8 12:34:52 CST 2007

> 8 74xx30's (8 input NAND) with each output feeding one of the inputs
> of the other stages.

That was my first thought but a quick look at the logic revealed that
pressing one button will make only one of the other seven outputs go


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