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I can live without them, and I'm sure Andy will provide all the help you need.

On Sat, Dec 21, 2024 at 06:17 PM, Mike Fraser wrote:

I found the files in my offline LTspice storage location.

Files are uploaded as 4053_tercio.zip.

Thanks, Mike.

?

I don't know if it matters (to John W), but your uploaded .zip file is missing the symbols "1To2.asy" and "switchana.asy".

?

Andy

?

?

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Best Wishes
John Woodgate
Keep trying

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Problem solved:

I added "OPA891" to Value 2 in both my OPA891 and OPA2891 symbols and now my sims all work using my user defined locations.

Thanks to all who helped me figure this out. You spent precious time helping me and I deeply grateful.

Steve

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It will nearly do that if you create your own libraries for symbols and models. See 'Settings > Search paths' in the Help. You do have to select the folder from a drop-down list.

? I really want to be able to add the symbol to the schematic and have LTspice find the proper model by itself.

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Best Wishes
John Woodgate
Keep trying

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Tony and Andy,

Thanks for the demo schematic which proves that the model itself is OK and that changing the line that defines the functions to match opamp2 works perfectly when the model is in the same directory as the .asc file and the .lib command defines the model.

It is a pain to copy the model to every directory with an .asc in it and add the .lib directive to every simulation.? I really want to be able to add the symbol to the schematic and have LTspice find the proper model by itself.

This means that the "Andy" modified model should be able to live in my directory and the symbol should be able to call it, but I am not calling it correctly in the attributes of the symbol.

BTW I did not confuse the netlist numbers on the symbol with IC package pins.? I agree that the symbol is not pointing to the Model due to an error in my attribute editing.

Does renaming the Model Suffix from .lib to .sub matter?

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It appears that the symbol is able to call the OPA891 spice model without problem.

I edited the model to make the pins agree with the conventional symbols, but it won't run

I used the TI model unedited and I changed the symbol pin net numbers to match, but it won't run.

It gives the same error every time:

" Unknown subcircuit called in:
xu1 0 n002 n003 v+ v- tss/opa891_model_v1p1.lib opa891"

I believe that someone has this model running, but I don't understand the inner workings of LTspice well enough to troubleshoot this error.

Thanks for all your help.

Steve

To save you the frustration of more wasted time, I have uploaded an OPA891 demo schematic, including a model suitably modified according to the exact advice given by Andy, previously

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It appears that the symbol is able to call the OPA891 spice model without problem.

I edited the model to make the pins agree with the conventional symbols, but it won't run

I used the TI model unedited and I changed the symbol pin net numbers to match, but it won't run.

It gives the same error every time:

" Unknown subcircuit called in:
xu1 0 n002 n003 v+ v- tss/opa891_model_v1p1.lib opa891"

I believe that someone has this model running, but I don't understand the inner workings of LTspice well enough to troubleshoot this error.

Thanks for all your help.

Steve

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Since Version 24 came it appears that I am supposed to keep my user defined models in a different place than the factory models, However I have not yet made the switch from the file structure I had previously.? I keep my models in subdirectories in the factory lib and sym folders.

That has been the advice from here for many years prior to V24.

I edited the Pin locations in the TI supplied OPA891_Model_V1p1.lib and renamed the edited version to OPA891_Model_V1p1SAH.lib.? I presume that I must copy that entire file to a directory where the symbol can call it.

I have made 2 symbols: OPA891 and OPA2891 which should both call the same Model.

I edited the Attributes as follows:

Prefix X

SpiceModel? ?TSS/OPA891.sub? (my customized models are in a TSS subdirectory)

Value? ? ?OPA891?

Remaining attributes are blank

It seems that the SpiceModel attribute should be?OPA891_Model_V1p1SAH.lib? rather than .sub. along with directions for the symbol to find it.

The SpiceModel attribute is optional. But if you assign a value to it, that should be exactly the name the of the model file. Whether this has a "sub", "lib", or any other suffix makes no difference. If you leave it blank, you need to inform LTspice of the name of the model file some other way. I prefer adding:

.lib ModelFileName

..as a SPICE directive. This is visible on the schematic and unambiguous. It is also easy to view this file file by Right-clicking on the directive > Open.

There is a whole lot of other stuff in that file other than the opamp model itself.? Should the symbol call the whole .lib file and it will figure out which part to use?

That is exactly what the .lib directive does.

Sorry for the newbee questions, but figuring out the directory structure in version 24 isn't easy for me.

I'm still smarting from when an attempted install of version 24 erased my entire Win 7 LTSpice installation without warning

That's strange, as I'm not sure V24 will run on Win7, according to the ADI website.

You would be wise to back up critical files before making any major changes to your system. I would imagine you have heard that advice before. I recommend you have a regular backup regime in place, preferably an automatic schedule. You never know when disaster will strike - don't make it any worse by not having backups.

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It's unwise to store your stuff in the LTspice 'working copies' of the native folders, that also? should never be touched. This is because your 'LTspice' becomes different from those of everyone else, and that complicates sharing and advising. There are two safe places to store, and I recommend using both - the folder that holds your .ASC file and your personal library, set up in User-defined Lib. Search Path folders.

Since Version 24 came it appears that I am supposed to keep my user defined models in a different place than the factory models, However I have not yet made the switch from the file structure I had previously.? I keep my models in subdirectories in the factory lib and sym folders.

I edited the Pin locations in the TI supplied OPA891_Model_V1p1.lib and renamed the edited version to OPA891_Model_V1p1SAH.lib.? I presume that I must copy that entire file to a directory where the symbol can call it.

I have made 2 symbols: OPA891 and OPA2891 which should both call the same Model.

I edited the Attributes as follows:

Prefix X

SpiceModel? ?TSS/OPA891.sub? (my customized models are in a TSS subdirectory)

Value? ? ?OPA891?

Remaining attributes are blank

It seems that the SpiceModel attribute should be?OPA891_Model_V1p1SAH.lib? rather than .sub. along with directions for the symbol to find it.

There is a whole lot of other stuff in that file other than the opamp model itself.? Should the symbol call the whole .lib file and it will figure out which part to use?

Sorry for the newbee questions, but figuring out the directory structure in version 24 isn't easy for me.

I'm still smarting from when an attempted install of version 24 erased my entire Win 7 LTSpice installation without warning.

?

Many thanks,

Steve

On 2024-12-20 09:45, Andy I via groups.io wrote:

Just in case it was not obvious already -

?

Use LTspice's "opamp2" symbol with this model, after making the change to the model file.

?

Change the name next to the symbol from "opamp2" to "OPA891".

?

Also add this line:

? ? .lib OPA891_Movel_V1p1.lib

to your schematic.? Keep that model file in the same directory with your schematic - or move it to one of your User-defined Lib. Search Path folders.

?

Andy

?

-- 
OOO - Own Opinions Only
Best Wishes
John Woodgate
Keep trying

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Since Version 24 came it appears that I am supposed to keep my user defined models in a different place than the factory models, However I have not yet made the switch from the file structure I had previously.? I keep my models in subdirectories in the factory lib and sym folders.

I edited the Pin locations in the TI supplied OPA891_Model_V1p1.lib and renamed the edited version to OPA891_Model_V1p1SAH.lib.? I presume that I must copy that entire file to a directory where the symbol can call it.

I have made 2 symbols: OPA891 and OPA2891 which should both call the same Model.

I edited the Attributes as follows:

Prefix X

SpiceModel? ?TSS/OPA891.sub? (my customized models are in a TSS subdirectory)

Value? ? ?OPA891?

Remaining attributes are blank

It seems that the SpiceModel attribute should be?OPA891_Model_V1p1SAH.lib? rather than .sub. along with directions for the symbol to find it.

There is a whole lot of other stuff in that file other than the opamp model itself.? Should the symbol call the whole .lib file and it will figure out which part to use?

Sorry for the newbee questions, but figuring out the directory structure in version 24 isn't easy for me.

I'm still smarting from when an attempted install of version 24 erased my entire Win 7 LTSpice installation without warning.

Many thanks,

Steve