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Neon pilot lights were always used with a series resistor.

In testing for immunity to transients, the transients are really quite energetic, and are supposed to be representative of transients that occur in real life.

John wrote, "... because it would probably explode due to excessive current if it ever reached striking voltage. " Interesting point. But I think it would depend on the impedance of the source of the

For grins, here is another one to try.? It shows one way to control SPICE's internal timestep while not imposing a harshly small Maximum Timestep across the whole simulation (which would make it

It;s a matter of simple observation that neon lamps flicker because they go dark at low voltages. If you attach one to a 1 metre cable and swing it in a vertical plane you can see the pattern of

Dave wrote, "... I found an effective lowest limit in defining Tr and Tf, of >10ps." I think you meant 10fs. But try this: V1 A 0 PULSE(0 1 1m {Trf} {Trf} 1m 2m) .step param Trf list 1f 10f 11f 20f

Tom wrote, "The gas tubes respond in several microseconds." That's nothing compared to 8.33 milliseconds, unless your definition of "several" differs from mine.? Therefore the arc should extinguish

I think you might need to mind your p's and f's.? ====================================================================================== Best wishes John Woodgate OOO-Own Opinions Only

Under lTspice 17.0.36, I found an effective lowest limit in defining Tr and Tf, of >10ps. Very simple model, only one V source: ;PULSE(0 1 4m {Trf} {Trf} 1m 2m) .step param Trf list 1f 10f 11f 20f 50f

In a simulation I have for a power oscillator, I use a green neon bulb as a bias adjustment indicator. https://www.mouser.com/c/optoelectronics/lamps-holders/?lamp%20type=Neon&product%20type=Lamps

Many of the "Neon" bulbs you could buy in the old days aren't readily available anymore. You could buy blue, red, yellow, orange..etc. They are filled with different gas mixtures other than Neon and

The gas tubes respond in several microseconds. For AC line voltages, they will effectively be a short during each half cycle. If one doesn't have an inline fuse, both wiring and spark gap could suffer

I've never used ferret before, but I thought I'd try it. My observation is the same as yours: it works in LTspiceIV and LTspiceXVII 17.0.36, but not in 17.1.9. This is new bug. It should be reported.

Did you try to download more than once? Any download may fail for no apparent reason. If the problem persists, please report it to ADI at the email address in the Help.

jagdish, I narrowed it down to these two main problems, and a possible third one: (1)? The model file st_ACST.lib that you uploaded has a few internal models that are defined in the wrong place,

I have tried to use the ".FERRET" directive in LTspice XVII version (X64): 17.1.9 and I get an error message saying trouble downloading file. It works in LTspice IV. Am I missing something or is this

Don't have time for words, but all very good things to consider.

The discharge concept becomes simpler if instead of thinking about the electric field between the electrodes which is the driver for the discharge process. Of course the shape and distance between

Great. Thanks.

There is a MVAM125 model, here: Files > z_yahoo > Lib > MVAM125.zip /g/LTspice/files/z_yahoo/Lib/MVAM125_test.zip Andy