This is placing a zener diode between power and ground to conduct above a trigger voltage?
On 26 Feb 2018 21:02, "gregebert" <[email protected]> wrote: > > Even though the nixies operate around 170V, they provide some voltage drop > so that the driver doesn't see the full 170V. If you use a driver rated at > a lower voltage, you want to provide protection as Mr. Forbes does (the > zener diode) so that the driver doesn't get stressed from leakage current. > > The other option is to use a driver rated for the anode supply voltage. > > If you do neither of the above, it's possible for leakage current thru the > nixie to result in voltage higher than the driver is rated for. At this > point, welcome to the jungle..... > Whether or not a driver degrades over time is a matter of device physics. > > My own belief is that MOS devices will get destroyed because oxide > destruction is voltage-related. > Bipolar (ie NPN) destruction results from excess current (basically > melting) so I think as long as the current is very small, on the order of > micro-amps, the driver wont get destroyed. But I do wonder if there is > long-term reliability impact (degradation) from some other mechanism that > would cause leakage to increase over time. > > > -- > You received this message because you are subscribed to a topic in the > Google Groups "neonixie-l" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/neonixie-l/-5Jt1SSYl3s/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web, visit https://groups.google.com/d/ > msgid/neonixie-l/7d67a2f9-f36e-45e6-86b8-9feee92fbc93%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/7d67a2f9-f36e-45e6-86b8-9feee92fbc93%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- 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/CANtqo3kwfT3EdzjmH%2BO4PwVGhqQsSS1Ycu_Oy820U3c7raHROw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
