Yes, that's right but as this circuit does not have a constant connection, there are cables and connectors which can be open, have false contacts, and even can have high impedance ground connections, it's better to integrate the protection into it. And I didn't tell I invented it :) ; this circuit is repeated ad nauseam in every CMOS semiconductor manual of the 70's-80's, that's why I love it. Zeners are a good alternative when one does not have a VCC reference or when the input voltage can be higher than the highest available power source (which can happen too with an un-energized circuit whose input must not be shorted in that situation). I don't use them much because they are more expensive and are slower to start conducting, besides having a higher capacity. But for this kind of hobby applications most of the times is just a matter of taste :).
On Wednesday, September 27, 2017 at 11:11:28 AM UTC-3, gregebert wrote: > > That's basically the same method used on ICs for input devices. I > typically use a zener diode. > > As long as there is another device driving the MOSFET, such as an IC, you > dont need to add that form of protection because the driving IC will > already have that onchip. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/62b49171-efb6-4f0c-8986-3326a093a009%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
