If you’re not familiar with the 555 timer, suffice it to say that this ... total propagation delay (~ 5.2 ns) plus some small R and C of the circuit itself. When used with typical RC values ...
If they use an Arduino, it should have been an ATtiny. And of course, if an ATtiny was used, there should have simply been a 555 timer. This time, however, [Tim] decided to actually show how this ...
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