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I'm not sure what you mean there, I think the arc, or the detection event in a GM tube can be considered 'low' resistance. I'd like to re-establish credentials as to why we're discussing this on

Just a thought, I was thinking the resistance drops non-linearly and what ever the source can supply is the current.

Oh sorry. Uploaded again.

Your zip contains filt.sub and filter.asy, but your model is looking for filter.sub Sent: Wednesday, July 12, 2023 9:07 AM To: [email protected] Subject: EXTERNAL: Re: [LTspice] Filters (Butterworth,

Understood, he's using the neon as a G-M tube, but the common G-M circuit already addresses the issue very simply.? G-M tube capacitance is about 5pF, the neons I've just measured are under 1pF, so

I uploaded my filter attempt to the file section. Hope all is self contained and it works. Anything to correct? — Christoph

Bonkers, " It is possible that the high current pulse when the bulb triggers is responsible for some of the chaotic behavior.? In order to remove the effects of the high current spike when the lamp

no probs - and yeah, don't know why he's using a couple of transistors, a very high value resistor is all that is used for G-M tubes. The high voltage ensures avalanche multiplication, and the low

Bordodynov, My subcircuit and symbol ( /g/LTspice/files/Temp/paschens-spark_gap.zip )

Paschen's Law *({B} * {p} * {d}) / log({A} * {p} * {d}) - log(log(1+(1/1.2)))-{C}* has nothing to do with resistance except that I believe you need to know the voltage to find the current.

Going to this thread and downloading the downloaded file, I was hoping to see the model of the arrester. What I saw had nothing to do with LTspice, except of course the arrester symbol. I am very

Thanks Bonkers, I've been to techlib missed that circuit.

Tor, thank you, I've seen it. Looks over complicated, but I'll keep it in mind.

Yes, that's true. Right now I am assuming small cylindrical electrodes.

Interesting topic, relates also to neon bulbs, gas arresters etc. I was going to mention that some (all?) neons have some radioactivity - as it bleaches out any variation in striking voltage due to

I found an interesting article on the subject: https://www.researchgate.net/publication/339964809_A_parametric_SPICE_model_for_the_simulation_of_spark_gap_switches Seems quite complicated. br, Tor

That's it I forgot the pressure even though it's in the equation.

The shape and the type of the electrode also change the arcing characteristics.

Yes I am familiar with Paschen's Law just don't know it like the back of my hand.

It is also related to gas pressure. There are graphs on the wikipedia page for Paschens Law that show breakdown voltage versus gas pressure, but I cannot recall if it included gap length. There is a