Don't feel responsible for other's mistakes.and the manuals are not read, it is only a matter of time when someone connects + 24V to this input.
1) this is invalid, because there is no internal pull up74LVC14 have not defined output level for high impedance input.
if we connect a button to the input, for example, we have several options
What does this mean? At the switch? No. At the resistor? No. At the IC? No....where else?Option three, requires 3 wires
) this is invalid, because there is no internal pull up
2) this is invalid, because there is no internal pull down
Btw: I disagree with some informations at schematic of post#8. At least they are questionable.
Yes. This is one....C1 to 1kV , but D1 is only 50V.
Makes no sense to me. Two inductors plus a series resistor limit the current and the rise rate. At least for the first nanoseconds.Why is next to the 4V zener diode 1kV capacitor ?
Because of speed , Zener diode is semiconductor device and have some reaction time typical <3ns.
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