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Jon, Thanks for that wonderful letter you wrote. I forwarded it to the Chief Technical Officer at Linear. Hope that's okay. For your question, it might help you to know that you can see what your {}

I want to start out by saying that I'm a hobbyist, not an electronics professional. When I first heard of SwitcherCAD III/LT Spice perhaps a year ago, I went to the Linear web site with the intent to

<helmutsennewald@y...>" <helmutsennewald@y...> wrote:

<helmutsennewald@y...>" <helmutsennewald@y...> wrote: And again some more information. The model in my example file is from this link: http://www.duncanamps.com/spicevalvesp.html Another source is:

Hello Bill, I forgot to mention that the symbols for the triode, tetrode and pentode are all in the "misc" directory of LTSpice. I am not shure you were aware of that. Best Regards Helmut

Thanks! I'm checking it out now. Bill --- "Helmut Sennewald <helmutsennewald@...>" <helmutsennewald@...> wrote:

<wrljet@y...> wrote: Hello Bill, I did it once for a pentode. The model is included in the schematic, but this can be changed using a library file valve.lib. Then add instead .include valve.lib in the

Has anyone migrated any of the vacuum tube models floating around on the 'net to LTspice? Bill

Hello Helmut, S-parameters are a very useful representation of a given network. For a 1-port, they correspond to the voltage reflection coefficient, and they can therefore be displayed on the Smith

<colombobolo@h...> wrote: netlist Hello "bolocolombo", thanks for the S-parameter example. I tried it immediately and it seems to work. I have to admit that I have only a small idea about the

Hello Helmut. Thank you for your advice. I was able to modify the transistor models from the SPICE directive, or even better, by editing the model files for the NPNs. The .STEP is a good suggestion

<jgraham@...> Try these sites for more information: http://www.national.com/an/OA/OA-18.pdf http://www.national.com/an/AN/AN-856.pdf http://www.national.com/an/AN/AN-1255.pdf

Helmut you saved me again, thank you. Part of the confusion that I had was that I don't really know what the syntax should be. What I did was cut and pasted the example in the help file to my library

<bunnyblues2001@y...>" <bunnyblues2001@y...> wrote: Hello Bunny, the problem is that your model/subcircuit doesn't follow SPICE syntax. Your switch model in the library has to be only: .model CSWITCH1

Then it should have been able to include the file. Until the help documents the paths searched for .lib and .inc files. Until you get the problem figured out, you might just use absolute paths. --Mike

That was the first thing I checked. There's only one extention on the file. Does the rest of the code check out?

wrote: - - - > SNIP < - - - If anybody knows of more recent works than what I previously cited, I am definitely interested in learning about them!! I've been putting together an EXCEL spreadsheet that

<jgraham@o...> wrote: If you're employed as a design engineer, sometimes you can get a vendor to develop a model on request. Mere mortals have to use what's available on published data sheets and try

What's the best way of creating an opamp model if the manufacturer does not have a spice model for it? Thanx, -Jon

Is the file really called "MYLIBRARY1.LIB" or "MYLIBRARY1.LIB.txt"? I turn off "Hide file extension for known file types" in Explorer=>Tools=>Folder Options=>View "MYLIBRARY1.LIB" needs to be the full