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Yes, I looked at all the spark gap models and none were satisfactory to my needs.

I uploaded a new file. Now I get that ltspice thinks B is a node. Hello Tony Casey, I'll try your first option later. Thank you.

What I would suggest is that you initially develop your spark gap model as a schematic, without worrying too much about SPICE netlist syntax. You can then extract the netlist and use that as a basis

I had a reference to help me with model cards, but I seem to have misplaced it.

OK, so I uploaded a new file. I get a "singular matrix: check node u2:b" error. Spice thinks my variable is a node.

Richard, By the way -- I should have said this earlier, but I forgot to -- What you did was the reason for the error message. You had two capacitors both named "Cspark, inside of the same

It looks like Richard wanted his comments to define parameters. Of course they don't.? Having a line like this: * A = 5.19e-11 makes it a comment, where it does nothing.? It does not define a

I suppose the algebra could be included as comments also. Maybe Richard thought that the * worked for both lines of text.

Oops, typo alert. I wrote, "and then another resistor also named Cspark" but that should have been "and then another capacitor also named Cspark". Andy

In short, every bit of your subcircuit is not SPICE.? It's pretty algebra (if also incorrect), but it is not SPICE and it doesn't belong inside a subcircuit. The only parts of your subcircuit that

A fresh install rarely helps, especially when the problem is a mistake in your circuit. By not including your circuit (the .ASY and .ASC files), you aren't helping us help you.? We can't run the same

I already have backups of my stuff, so I did a fresh install and before loading my backups I did an autogeneration of the spark gap and I got the same warning about the multiple instances. What am I

When you autogenerate, the .ASY includes the path to the subcircuit, If you also put an .INC statement on your .ASC, you get the 'multiple instances' error.

No, all I did was open the subcircuit right click on the circuit name to auto-generate a symbol. Then I placed the symbol on my circuit and run it. Thanks for your help by the way.

That problem isn't in the subcircuit, but there is a problem there. The expression for the capacitance is wrong, as you can see because it increases with the separation of the electrodes. The

File in temp labeled sparkgap.sub.

I made a subckt of a spark gap and linked it to an edited neonbulb symbol and now I get the warning "multiple instances of "C:U2:spark"". Please help me straighten this out.

I looked in the group's Files </g/LTspice/files> section and did a Google search, but there were no hits. So unless someone comes forward, I guess the answer is "no". -- Regards, Tony

Looking for an LTspice model for the MAX 31740 Ultra-Simple Fan-Speed Controller.? Although AD has apparently acquired Maxim, they haven't developed a model for this device.? Has any members

That's the home PC: OS Name Microsoft Windows 11 Pro System Name XOTIC-PC System Manufacturer ASUS System Model System Product Name Processor 13th Gen Intel(R) Core(TM) i9-13900K, 3000 Mhz, 24