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Re: I'm ready to give up LTC all toghether.
Gunoi Nare
Thank you Andy. I do know these "facts" but simulator programmers have a tendency to "improve" on the agreed parameters. It is always wise to ask what the programmer thinks in this respect. G.
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Re: Visay spice model Bridge rectifier KBU6B
Hello,
There are examples with bridge rectifiers (schematic, symbol, models) with a library of models. Some models in this library file are similar(voltage, current) ?to the asked model.? ?? These bridge rectifiers are suitable for 50Hz/60Hz operation. Don't use them for switching supplies above 1kHz due to their long reverse recovery time. This recovery time is modeled with the parameter TT in in the SPICE-model. ? Best regards, Helmut ? |
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Re: LTspice XVII Co-exist with LTspice IV?
? ?" ...it will work with anything denoted with the ".asc prefix" at the end.? Even files that are simple text files. ? ? Instead of displaying a schematic...you will read that text on the schematic screen." I think that could be confusing.? I don't want people to get the wrong impression. LTspice XVII did not change the input files.? It still uses the same input and output files as before. If you have an LTspice schematic that was from LTspice IV, or from LTspice III, or from SwitcherCAD III, they open directly in the newer program (LTspice XVII) and look like they did before, because nothing's changed! It is just a better version of the old LTspice.? Yes it was a partial re-write of the source code.? But it is not a totally brand new program. Andy |
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Re: LTspice XVII Co-exist with LTspice IV?
?...it will work with anything denoted with the ".asc prefix" at the end.? Even files that are simple text files. Instead of displaying a schematic...you will read that text on the schematic screen. Be sure and set up your laptop properly...IF you can ..use a separate partition for win7 vs. win8 or win10. Otherwise you will need* to "open all .asc files" with the LTSPICE IV logo/icon under LTSPICEXVIII...and any files you need to open in LTSPICEIV using "drag and drop" (that IS one easy way to do that one). Old 32-bit LTSPICEIV copies on old XP machines won't be an issue.? Just use "sneaker-ware" and save from a USB drive (or old 3 1/2 inch floppies)..to your system.? Not sure you will have a floppy on a 64-bit box...but that is still possible.? I have a old PSPICE copy for DOS I have yet to find a machine for ..but still looking. 16-bit code does work under stuff like FreeDOS..but you have to be careful porting that back to newer machines.? I am sure the expert around here on the "old stuff" is still John, but if Mike E. has some old "DOS/Windows horror stories" about FORTRAN77 SPICE?he should post them. <---works hard for a few good chuckles every now and then. W. Warren *[ ..I recommend a good text editor..TextPAD? ??? ?...or related freeware ..and stay away from editing anything ????? ? in Notepad...even the recent version of Notepad ] |
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Re: LTspice XVII Co-exist with LTspice IV?
Thanks Andy,
I just ordered an I7 laptop with Win10. It's a 64bit. Maybe I should go to the XVII. Can XVII work with files already created in IV? Is it an easy transition from IV the XVII without having to learn a lot of things? I am just barely ok in using IV ( maybe not even barely ok!!). |
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Re: LTspice XVII Co-exist with LTspice IV?
...I think I already documented some of my early experiences with Win10..and dual installations.
I still have my old Win7 files on a separate Win7 partition..and can access them under Win10 or even run them under the old LTSPICEIV program in Win7. Some of you might be wondering why so many are using WINE here and not just Windows. Because all that expensive software (well a lot of it anyway) can be duplicated under Linux...and its "freeware, shareware..user-ware" models.? Take the Eagle CAD program for instance.? It was never taken to 64-bit..and got grabbed* by the AWR "Microwave Office" people some time back.? It is their drafting program now...and file convertor. You can still find Eagleware on the web and in some old Ubuntu installation versions.? It easily will convert various SPICE versions for CAD purposes..or CAE versions from its CAD format.? I have transliterated some old microwave designs into LTSPICE circuits using both Eagleware (see:?? and gEDA/ngSPICE ) ? Give Mike E. some credit..at least for the Mac users...they "might be getting an update" good enough to port to FreeBSD and/or other Linuxes.? W. Warren *[ ?? ?? ? ] ? ? |
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Re: LTspice XVII Co-exist with LTspice IV?
alan.revera?wrote: ? ?"Is VII a lot better? What is the major advantage of VII over IV?" I'm sure you meant XVII, which is the new version. ?(Mike/LTC skipped a lot of version numbers on this, going straight from 4 to 17, I guess because we are nearing 2017.) There are not many significant differences to most users between IV and XVII, except for this one: ?XVII supports 64-bit program operation if your operating system supports it.? If you are running a 32-bit version of Windows, as many people do (even though their hardware is 64-bit capable), then you won't get this advantage.? The 64-bit version can run a lot faster. The 64-bit version probably can also handle larger networks (able to access more memory), but very few people run simulations on networks so massive that they run out of memory on a 32-bit O.S. Most of the other program differences might be considered "cosmetic", affecting the user interface.? Menus, how window panes work, ability to use dual monitor screens, etc. (Just my opinion, and yours might differ.) Regards, Andy |
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Re: LTspice XVII Co-exist with LTspice IV?
¿ªÔÆÌåÓýHi Jim I m running both on WINE. So far so good. Al D.
On 08/15/2016 09:29 AM, Jim Thompson
ltlist@... [LTspice] wrote:
Can LTspice XVII Co-exist with LTspice IV on the same machine without -- AC2CL I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything. - Nikola Tesla |
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Re: Benchmarking the new LTspice
Greetings.. Here is some food for thought... Let us assume you have a computer ?which can support 4 threads... Assuming ? that the OS is smart in optimizing the workload , you ?should gt a maximum iimprovment of 3.5 to ?4 over ?a single thread...(Amdhal's law will kcik in somewhere) Take a large schematic with a long transient run... Repeat it 4 times on the main schematic page .. Make sure no nodes are named the same excepting ?input and 0.. We know that such a circuit matrix is inherently separable and solvable as 4 independent smaller matrices. Under this condition, allowing for overhead and Amdhal, you should see an improvement of?3-4 ?on the same machine over ?when you operate it with single thread.... Make sure you just simulate and don't plot anything.. Make the sim time very long to minimize overhead issues. On 4 threads, I have never been able to get this number over 2.7...... Cheers AG |
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Re: Benchmarking the new LTspice
Hi If you want the fastest windows PC, look at "gaming" class computers. They have fast CPU (i7, 4Ghz or better), fast memory, SSD, Hi perf GPU and minimal I/O expansion.?The only thing you really don't need is the superfast GPU, unless your planning to use 3D graphics. |
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Re: LTspice XVII Co-exist with LTspice IV?
Hi I'm running both versions also (WIn 10). If you Rht-click on a schematic .asc file, choose "Open With", then choose "Choose another app, The previous version will be listed in the "other options" section. The name is the same for both apps, but if you choose the one in "other options", it will launch the previously installed version |
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Re: Benchmarking the new LTspice
John Woodgate
¿ªÔÆÌåÓýI suspect that Win 7 is recommended because most CAD programs have not yet been optimized for Win 10. ? With best wishes DESIGN IT IN! OOO ¨C Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ? From: LTspice@... [mailto:LTspice@...]
Sent: Monday, August 15, 2016 11:44 PM To: LTspice@... Subject: [LTspice] Benchmarking the new LTspice ? ? LTspice Yahoo Group readers, ? |
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Re: Benchmarking the new LTspice
Allan,
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My home laptop is an older Lenovo quad core i7 and I also have an ancient dual core Pentium desktop machine that can't support Windows 7.? When I get home (after work and after my tennis match), I will run the benchmark on both and report back. I am looking to buy a Core i7 Extreme 6/12 or 8/16 that runs at 4.2 GHz or so with lots of RAM, a solid-state drive and super quiet cooling.? I am hoping it will be more than twice as fast as my office computer. ---In LTspice@..., <allanvv@...> wrote : I don't think you really need to go for a workstation PC. You wouldn't need an overpriced workstation GPU for basic CAD like for running SPICE or PCB design. My recommendation is to buy a good desktop CPU with 6-8 cores, buy a gigantic $50 CPU fan (Noctua), and overclock your CPU. While some simulations can make good use of 4+ cores, single-threaded perf is still really important for a lot of applications and you'll get a lot more performance than any stock computer. With a good heatsink+fan, you can get great single-core GHz above the Turbo Boost frequency, and also good 8-core performance at the TB frequency without even coming close to thermal limits. If I weren't traveling at the moment, I'd give you the performance of your benchmark at 6x4.4 GHz on a similar CPU generation. Allan
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Re: Benchmarking the new LTspice
ehydra
It doesn't make sense to benchmark an 'unrealistic' circuit model. I would say it is badly written - or one can say lightyears ahead the current capability of LTspice in the senses of acceptable run-time.
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Say, a new user of LTspice chooses this example jig as a first trial to see if LTspice is fun. He will throw it away! And maybe the IC product too. For experts (freaks?) it might be interesting to see such benchmark results fiddling with Reltol et al.. I would prefer a more common example. No, I don't have one for the public AND interesting to many people. - Henry analogspiceman@... [LTspice] schrieb: LTspice Yahoo Group readers, It would be fun to see what run times other group members report for |
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Re: Benchmarking the new LTspice
Allan Wang
I don't think you really need to go for a workstation PC. You wouldn't need an overpriced workstation GPU for basic CAD like for running SPICE or PCB design. My recommendation is to buy a good desktop CPU with 6-8 cores, buy a gigantic $50 CPU fan (Noctua), and overclock your CPU. While some simulations can make good use of 4+ cores, single-threaded perf is still really important for a lot of applications and you'll get a lot more performance than any stock computer. With a good heatsink+fan, you can get great single-core GHz above the Turbo Boost frequency, and also good 8-core performance at the TB frequency without even coming close to thermal limits. If I weren't traveling at the moment, I'd give you the performance of your benchmark at 6x4.4 GHz on a similar CPU generation. Allan On Mon, Aug 15, 2016 at 6:44 PM, analogspiceman@... [LTspice] <LTspice@...> wrote:
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Benchmarking the new LTspice
LTspice Yahoo Group readers,
I am shopping for a new home computer optimized to run LTspice and have been corresponding with Orbital Computers. ? Danny Payne, the owner there was willing to benchmark LTspice for me.? He downloaded the new version (LTspice XVII) and tried running some of the test jigs.? He chose the 3752-1 test jig, which was a very good choice for someone not familiar with LTspice because he chose a file that maxes out all eight of my work computer's threads. However, it turns out that either the 3752-1 model or its test jig is not well written because it throws lots of Def Cons with the default simulation settings.? It runs much happier and faster with the Alternate Solver selected, Reltol relaxed to = 0.01 and Trtol set to 7 (click the Hammer icon to access the Control Panel and then click the Hammer tab to access the SPICE settings). On my (4 cores / 8 thread) Xeon E3-1240 v3 @ 3.40GHz with 8GB ram (NVIDIA Quadro K600) at work, the SPICE Error Log reports a run time of around 126 seconds (once the Alternate Solver has been selected and Reltol has been set to 0.01 and Trtol set to 7).? NOTE: Do not plot any traces when running this benchmark.? With the same simulation settings, the old LTspice IV runs this test jig in 137 seconds, which is about 8 percent slower. I am going to send Danny Payne this message and have him run the benchmark with the same settings on an LTspice optimized computer platform and report his results (as well as the system configuration details).? It is interesting that he recommends Windows 7 for all CAD programs. It would be fun to see what run times other group members report for this benchmark. |
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Re: LTspice XVII Co-exist with LTspice IV?
John Woodgate
¿ªÔÆÌåÓýThat 'w/' is a bit of a nonsense, too. 'With' or 'and' or even '&'.? But the whole reference to 'schematic capture' is surely a legacy from the days when that was a rarity. ? With best wishes DESIGN IT IN! OOO ¨C Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ? From: LTspice@... [mailto:LTspice@...]
Sent: Monday, August 15, 2016 9:45 PM To: LTspice@... Subject: [LTspice] Re: LTspice XVII Co-exist with LTspice IV? ? ? Hello Andy Whichever program you installed last, would be the one that automatically opens when you double-click on a schematic file. " ?Not ""SPICE Simulator w/ Schematic Capture" for both versions. |
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