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There should be no need to regenerate anything if you mean LTspice's native models. Version 24.1.x uses the same models and symbols as version 17.x.x, and adds many new ones. If you have actually found a problem, please explain more clearly about it. You could look at 'Program Updates' in the FAQ in the Help.

Hi,

I just installed LTspice 24, I can use both old spice and new, they both work!

I still need to auto generate the models used by old LTspice (to build the symbols) to be able to use them in LTspice 24, is there a way that I can use the models in the new LTspice 24 with out regenerating please?

Regards,

Suded

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I just installed LTspice 24, I can use both old spice and new, they both work!

I still need to auto generate the models used by old LTspice (to build the symbols) to be able to use them in LTspice 24, is there a way that I can use the models in the new LTspice 24 with out regenerating please?

You are not very clear about what you have actually done.

Did you install LTspice 24 alongside your older existing version of LTspice (presuming V17.x), or did you effectively perform an upgrade over the top of your existing installation?

Or did you mean that old schematics created with your previous version still work with the new version?

You are also not clear which version 24 you have just installed. I presume you mean V24.1, since that is the latest one available on ADI's website? (There are significant changes between 24.0 and 24.1.) Now we're at 24.1.8 (at the time of writing), most of the initial issues arising have been addressed, but not all of them.

Whether you can use auto-generated symbols from your old version depends whether they still exist. Did you back up the old libraries? (BTW, you didn't auto-generate any models, it was the symbols you auto-generated from the models. Or do I completely misunderstand what you mean?) We can't know what you did unless you tell us. I would advise anyway, that you get out of the habit of using auto-generated symbols. There are several issues with them:

1. They are hard-coded with your local machine's absolute path, making sharing them problematic.
2. They contain no information about the function
3. They're ugly.

--
Regards,
Tony

开云体育

I installed V24.1, Both LTspices are working, I did not upgrade, Yes, auto generated the symbols from 3rd party models, I can still use them in old LTspice just like before

How do I use the auto generated symbols in LTspice 24.1 (if I can)?

I have saved all the relevant models in a file on my desktop, so I have backup, can I use the same symbols in LTspice 24.1 if I copy and paste the auto generated symbols from old LTspice XVII to LTspice 24.1 in the Autogenerated (in library) folder?

I see no reason why you can't just copy your auto-generated folder from your old library to the new one, there has been no change in file format that I'm aware.

I have three versions of LTspice installed. All of them are set up to use the same libraries. Although (as far as I remember) LTspice 17 used ..\Documents\LTspiceXVII\lib by default for its library folder, it also searches %APPDATA%\Local\LTspice\lib, if it exists. So you could conduct an experiment by temporarily renaming?..\Documents\LTspiceXVII\lib to - say,?..\Documents\LTspiceXVII\lib.bak and checking if LTspice 17 still shows symbol libraries in the Component Chooser (F2). This is useful because LTspice 17 will then use the new symbols and models from LTspice 24, which is updated, whereas LTspice 17 isn''t.