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Schematic shows different sized text

 

My file is AC_Coupling.asc and has text that has been made smaller than it was in older LTSpice versions. The weird part is some text is small but other text is normal. Using version 24.0.12.


Re: Schematic drawing issues

 

Just reporting that in 24.1.5, and using my 65 inch 4k screen....
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When adding a wire, I can very faintly see the extended crosshairs and cursor.
So faintly are the crosshairs that LTspice 24.1.5 is unusable with my 65 inch screen.
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I can see the cursor as long as I don't add a wire.


Re: diode search tool

 

Typo alert.??I wrote:
...? It's about a million times easier than combing through 20 years of scattered models, ...
Andy
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Re: Issue with Nexperia BUK7S1R0-40H PET LTspice model

 

I just uploaded "BUK7S1R0-40H with 2019 model.zip" to the Temp folder.
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Andy
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Re: Issue with Nexperia BUK7S1R0-40H PET LTspice model

 

Since the model is a .SUBCKT with 3 pins, and the symbol has 3 pins, I conclude that the most likely cause of the problem is user-error (cockpit error).? You did something wrong.? Try again.
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Andy


Re: diode search tool

 

FYI, by looking at a diode model, you can't tell how it performs.? You would need to do several simulations of each and every diode model, to extract the data you are looking for.
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Much, MUCH easier to just look at the table that is already built into LTspice itself.
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Andy


Re: diode search tool

 
Edited

As a first step, did you try searching through all the diode models that come with LTspice itself?
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It has them all collected together already, in a format that makes it simple to search for near-equivalents.? It's about a million times easier than coming combing through 20 years of scattered models, and somehow figuring out what characteristics you want to search for and how to do that.
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Andy


Re: LMR51606 for LTSpice

 

Thank you very much, that's what I was afraid of.


Re: LMR51606 for LTSpice

 

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No, you can't use it. If TI will not supply an unencrypted model (probably because the device uses a secret trick), you can get TI's PSPICE for free, and run the simulation in that.? The chances of finding a model elsewhere are very low.

On 2025-03-13 10:49, Tino B?hme via groups.io wrote:
Hello, I would like to use the LMR51606 in LTSpice.
I only found an encrypted PSpice library on TI. I've already uploaded the file (LMR51606.zip).
Unfortunately, I can't import the file into LTSpice.
Is there a way to use the model, or does anyone have one?
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Thank you.
--
OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion

Virus-free.


LMR51606 for LTSpice

 

Hello, I would like to use the LMR51606 in LTSpice.
I only found an encrypted PSpice library on TI. I've already uploaded the file (LMR51606.zip).
Unfortunately, I can't import the file into LTSpice.
Is there a way to use the model, or does anyone have one?
?
Thank you.


Re: Chan model for saturable transformer LTSPICE simulation #Transformer

 

Your transformer model is not correct. You have also set a very high voltage for such a small core. Here is my transformer model. See the file NonLinearTransformer_pulse_AB2.zip in the TEMP folder.


Re: diode search tool

 

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On 13/03/2025 10:37, thereitis via groups.io wrote:
thanks for the reply.
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since ltspice community has built by now a massive list of diodes, and similarly with components that include the ones provided by ltspice itself, i think we must have a software tool that can use this database to provide search facilities.
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in this regard, if i find a few people here, we can jointly start working on an open-source tool for the same. we can start working on it fro? scratch if necessary, but diode and transistors can be a starting point.
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request to reply if interested anyone.
If you do a search of the Files area of this group's site with the term "diode model", you will get 610 hits. Not all of them are actual diode models, but some of them are. If you are more specific with a device name, your hit rate will be better.

It's not actually that difficult to make a diode model yourself, and there is already a semi-automatic model generator in the files area too. It's not perfect, but model it produces are as good as many manufacturers' models. It's also fairly easy to do this in a spreadsheet (I have one).

A key thing to remember with surfing for models, is that there is no guarantee they are accurate - many you find are anonymous, and manufacturers' models are not always good. The onus is always on the user to verify the models they use.

--
Regards,
Tony


Re: diode search tool

 

thanks for the reply.
?
since ltspice community has built by now a massive list of diodes, and similarly with components that include the ones provided by ltspice itself, i think we must have a software tool that can use this database to provide search facilities.
?
in this regard, if i find a few people here, we can jointly start working on an open-source tool for the same. we can start working on it fro? scratch if necessary, but diode and transistors can be a starting point.
?
request to reply if interested anyone.


Re: Issue with Nexperia BUK7S1R0-40H PET LTspice model

 

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That error message sometimes appears when there is quite a different problem. It probably doesn't happen often enough for tracking down the reason and fixing it to be worthwhile. Examine your .ASC carefully, and check the attributes of all the components.

I wish the error message could be a bit more informative, by giving the numbers of pins, like this:

Port(pin) count mismatch between the definition of subcircuit "buk7s1r0-40h" (3 pins) and instance "xu1" (2 pins)

--
OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion

Virus-free.


Re: diode search tool

 

Many manufacturers have diode equivalency charts, or part selector guides, on their websites.? ?You can parameterize your searches and come up with similar parts according to some criterion.
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Have you tried that?
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If you could not find any, try harder.
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They might be less common for simple parts such as diodes (versus ICs), but I can assure you they do exist.
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Andy
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Re: Issue with Nexperia BUK7S1R0-40H PET LTspice model

 

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On 13/03/2025 09:16, MaticH via groups.io wrote:
I also tried using older LEVEL = 3? NMOS model by nexperia, with 3 pins. But no luck there either. I get Port(pin) count mismatch between the definition of subcircuit "buk7s1r0-40h" and instance "xu1" error. Even if both subcircuit and component have 3 pins. Anybody knows what could be wrong here ??
If you want a definitive diagnosis, you would have to upload your schematic together with all symbols and models in a zip to Files > Temp.

--
Regards,
Tony


Re: diode search tool

 

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On 13/03/2025 08:32, thereitis via groups.io wrote:
i was looking for a tool which can provide alternate diode models that match approximately to a given diode model.
unfortunately, i could not find any website or software.
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it would great if anyone shares any information in this regard.
I'm confused. Why do you want to find an alternate diode model model that is similar to one that you already have?

Or, did you mean an alternate diode? Perhaps if you could clarify, preferably by specifying the diode you want to use.

--
Regards,
Tony


diode search tool

 

hello members,
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i was looking for a tool which can provide alternate diode models that match approximately to a given diode model.
unfortunately, i could not find any website or software.
?
it would great if anyone shares any information in this regard.
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thanking you in advance.


Re: Issue with Nexperia BUK7S1R0-40H PET LTspice model

 

I also tried using older LEVEL = 3? NMOS model by nexperia, with 3 pins. But no luck there either. I get Port(pin) count mismatch between the definition of subcircuit "buk7s1r0-40h" and instance "xu1" error. Even if both subcircuit and component have 3 pins. Anybody knows what could be wrong here ??


Re: LM121 model??

 

Andy,
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You are correct, of course.? The original LM321 (as well as the LM121 and LM221) is described as a "Precision Preamplifier" in the 1976 to 1982 linear data books, as far as I've been able to determine.? The newer LM321 is more like 1/4 of an LM324.? Could you imagine if Signetics had decided to assign NE555 to, say, a new voltage regulator??
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Regardless, I've uploaded the original LM121, etc. data sheet from the National 1980 Linear Data Book and the application note, AN-79, from the 1978 Linear Applications Handbook.? They're in the file LM121-221-321.zip.? No SPICE model, though.? Sorry!
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John?