PWL with REPEAT/ENDREPEAT fails with zero start time and negative amplitudes.
There appears to be a bug in LTspice Version 24.1 that is still present in V.24.1.4. The Repeat/EndRepeat directive in some PWL source directives throughs an error. See my uploaded example file
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bwolfe58
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#158916
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Re: Stepping MOSFETs
I understand you can step .model files but can you step two mosfets that use the .subckt Larry
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larryg
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#158915
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Re: Stepping MOSFETs
That should not be the case. There is no special treatment of the number zero. Can you provide a test case that proves a problem? Works just fine over here. Best Regards, Mathias
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Mathias Born
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#158914
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
Depending on what those differences are, it might or might not be ideal to ask here.? There are not a lot of group members here who use both programs, but there are a few.? Some?have asked
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Andy I
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#158913
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Re: Stepping MOSFETs
I think you missed the context of earlier messages. The numeric .STEP'ed parameter is silently converted to a string as a "workaround". To use this directly, still requires the AKO: syntax. The new
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Tony Casey
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#158912
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
ngspice has its own mailing list.? It is still current as of 2025.? It is hosted on sourceforge.net. There is one list for Users, one for Developers, and one for reporting Bugs. Andy
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Andy I
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#158911
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Re: Transferring opamps and other libraries
Carlos, Yes I understand that.? But are they parts that CAME with the older version, or are they parts that YOU added to the previous version? People often forget that they added models to their copy
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Andy I
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#158910
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Re: Stepping MOSFETs
Can LTspice24 (vers. 24.1.4) .STEP through non-numeric parameter values? If it can .STEP only through numeric parameter values, then how does it eliminate the need to rename the models? Andy
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Andy I
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#158909
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
Ah, seen it now, however there are no messages yet !
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Carlo
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#158908
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
There is, however, a group named "Allspice", which is a group for users of all SPICE simulators. DaveD KC0WJN [email protected]> wrote:
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Dave Daniel
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#158907
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Re: Transferring opamps and other libraries
Andy, Of course I installed version 24.0, and I was talking indeed about the problems I was having when trying to run my sims with parts this version did not have in its library. Carlos
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Carlos E. Mart¨ªnez
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#158906
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Re: LTspice 24.1.4 - Limit function
Yes this is really a exciting feature for transient analysis of examples with behavioral sources. :-)But there is? a problem if i made only a .op simulation of a circuit with a huge amount of
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Friedrich Schmidt
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#158905
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
I believe the latest KiCad works with LTspice, but the problems with version 24.1 might compromise that. -- This email has been checked for viruses by AVG antivirus software. www.avg.com
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John Woodgate
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#158904
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
I'm aware of there is a groups.io for KiCad, however I can't see a specific group for ngspice (which is the Kicad's simulator under the hood). Carlo.
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Carlo
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#158903
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
It isn't, really, but someone familiar with both apps might advise you. -- This email has been checked for viruses by AVG antivirus software. www.avg.com
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John Woodgate
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#158902
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LTspice vs ngspice 12AU7 tube amplifier transient analysis
Hello, I'm not sure whether this is the right place to ask about the difference seen in tube amplifier's transient analysis between LTspice and ngspice. The tube amplifier was the topic of this thread
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Carlo
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#158901
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Re: Stepping MOSFETs
Yes, I can confirm this does now work in 24.1.4, provided "0" isn't one of the model names, which I had inadvertently done in the example I uploaded. But when revisiting this, I note that it also
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Tony Casey
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#158900
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Re: Stepping MOSFETs
This is a good example for how ADI is indeed paying attention to the valuable feedback from this group. In LTspice 24.1.4, numeric parameters implicitely convert to strings. As a result, the old way
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Mathias Born
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#158899
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Re: LTspice 24.1.4 - Limit function
One of the exciting new features of LTspice 24.1 (which is the best thing since the invention of sliced bread :-) is that it compiles the math expressions of behavioral sources into highly optimized
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Mathias Born
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#158898
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Re: Transferring opamps and other libraries
Carlos, Andy I is correct when he mentions locations for different versions of LTspice. I still have both LTspiceIV and LTspiceXVII on my computer system. Both versions are in their factory default
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Mike Fraser
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#158897
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