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Is there any body who obtained the results of the .Net analysis directly from a text file without the help of Waveform Viewer (just like HSPICE)?

I also found that... but I don't know how to make it work on ltspice... the format is different.. Do you know how to make it work on ltspice??

Hi shadow,

Have you searched a little on internet ? I found that :

I also need an op27 op amp.. sorry for the double post... thank you..

Good day to all...

Do any of you guys have 1n4153 and 1n746a models for ltspice... I need to simulate a circuit using those 2 diode...

Any models? or similar diode models? Thanks..

Vlad wrote:

The Gmail IDs can be used to login into Yahoo, the Group settings allows for using a Gmail or a Yahoo email address as the primary one.

Interesting! That is news to me. Thanks.

Shiggy-san wrote:

Q1) Would you tell me the method of ascertain the yahoo ID.

I can see that you used the Yahoo! ID of "hiromasashigematsu".when you
posted your earlier messages to the [LTspice] group. (We can see that
from the Message listing.) This should mean that "hiromasashigematsu"
is the one you used when you joined the [LTspice] group, so logging
into Yahoo with that Yahoo! ID SHOULD give you access to the [LTspice]
files.

If you have other Yahoo! IDs, they might or might not also be "signed
up" for the [LTspice] group (depending on whether you also joined this
group from those Yahoo! IDs too). You must use a Yahoo! ID that has
joined the [LTspice] group, because the group's files are accessible
only to members who have joined the group.

If you can see the files, but can't download them (as others have
suggested), then I don't know why. That is very strange.

Good luck!

Andy

--- In LTspice@..., "yogasmitha" <amba_200@...> wrote:

Also, I have saved the .asc file in database for your reference which i have been using/trying to modify :flyback_nom.asc

--- In LTspice@..., "yogasmitha" <amba_200@> wrote:

--- In LTspice@..., "imbvlad" <imbvlad@> wrote:

Hello

You may want to try the other Yahoo group, "switchmode", they may have the answers you're looking for.


Good luck,
Vlad

Hi,
i was thinking that the main component what i have used is of LT and so this group should be aiding me.

Thanks
Yoga

Yoga,

You are missing a ground on the bottom half of your circuit. Here are some other comments:
1. You could 'clean up' your circuit by combining all the parallel caps and series resistors.
2. You don't need any caps in parallel with the DC voltage sources that have zero resistance.
3. Your current pulses aren't going to work right, because the sum of the various times exceeds the period.

Rick

Hello all of you,
I download:
NE555 (Tansistor leveltimer.asc from Files&#92;Files sorted by message&#92;msg_31483 ( NE555 transistorlevel/leveltimmmer.asc }
Why is V( out) or V(OUput) are going in strange frequencies ?
Thanks
Best regards
Philippe B.

Mike,

The -nowine switch is documented in the LTspice's help manual, see Modes of Operation > Command Line Switches:

"Prevent use of WINE(Linux) workarounds."

I don't know if this happens to all, but when using LTspice normally, that is, without any arguments passed on to command line, trying to resize, for example, the dialog window for adding a spice directive, will resize the perimeter without the contents of it (I hope I found the right words). If there are more than 4 or 5 lines of text, they will be hidden (but you can still scroll through).
Using -nowine will allow resizing the contents, too, so now you can have an entire novel and be able to see all the text.

The downside of this, of using -nowine, is that when you try to move a component (e.g. with F8), it will leave minor dots behind (at grid's spacing), traces of them like crumbles, which cumulate, but they are gone the instant you drop the symbol with the mouse-click, or when the viewpoint of the window changes (for example when you zoomed in and, when moving the symbol, the current view of the schematic shifts to adapt to your direction).

This isn't as bad as it seems, since moving components doesn't mean playing around with them, and there's an actually good indirect effect: suppose you want to copy a symbol and move it, symetrically, downwards or anywhere; the trail will let you know if you strayed from the path.

The custom launcher is used simply to tell WINE that I want to use the INI from the LTspice's directory (custom installation, models, etc) and to add the -nowine switch. The clean installation is in a different location and uses the %AppData% from Windows.

This is about as best an explanation I can come up with right now.


Good luck understanding,
Vlad :)

--- In LTspice@..., "imbvlad" <imbvlad@...> wrote:

Mike,

The new .ini location follows the Windows' one:

/home/<user>/.wine/drive_c/users/<user>/Application Data/.

Personally, I run the clean version the way the installer made the launcher, and the custom version like this:

env WINEPREFIX="/home/<user>/.wine" wine Z:&#92;&#92;opt&#92;&#92;Progs&#92;&#92;LTspiceIV&#92;&#92;scad3.exe -nowine -ini Z:&#92;&#92;opt&#92;&#92;Progs&#92;&#92;LTspiceIV&#92;&#92;scad3.INI

( -nowine because I can resize the components' dialogs, with the downfall of traces when moving symbols -- minor)

Vlad

Vlad,

Thanks for the reply. I wonder what the option "-nowine" does. I tried google and visited pages like

"
"
"

But I cannot find that option anywhere. Do you have a link you can post?

I also wonder why you use your custom launcher, and what do you mean by "downfall of traces when moving symbols"?

Thanks,

Mike

Hi RainbowSally!

Wow, you weren't kidding. OMIGOD, you should have seen the circuit I came up with while you were redoing the first one...somehow I got the notion in my head I needed to use peak detecting op amp circuits to define the top and bottom of the sawtooth, so I had both positive and negative peak detectors feeding a potentiometer going to a comparator....

....your circuit was a marvel of sophisticated elegance, I can't thank you enough.

I would post my new version of your re-do, but...I'm still waiting for LTspice to find an operating point LOL!!!

I'm going to bed now. If, in the morning, it gave an error (time-step error most likely; I think that's when it can't converge?), I'll post it asking for help getting it to run, and we can talk about design at the same time.

However, if it does finally run, then I have no reason to post it here; it would be off-topic to discuss the design elements (I've added a new section you haven't seen yet that's the point of the 1st circuit) - so am wondering where you'd like to continue the discussion...electronics_101? funwithtransistors? (both yahoo groups).

Very Best, with gratitude for your help, Maturin..errr, Gandolf LOL

Hi Helmut,

please accept my apologies; it was the end of a hard day with some unexpected blows, and I got into complaint mode (never a good idea)...and came off like a mixture of a jerk and idiot (take your pick). I promise to never complain about LTspice again (no matter how frustrated I get LOL).

Fact is, it's a gift worth its weight in diamonds, and I'm grateful to have both a spice with a very user-friendly interface and a yahoo group LTspice moderator who has displayed extraordinary patience and helpfulness for years...wow.

I'll see if I can recreate that node problem with the TI model, and if I can, post it here; maybe it'll be helpful to find out why some outside models/symbols are problematic to use. In the meantime, I'll take the suggestion of another poster to use the universal op amp model and change parameters as needed; GREAT idea, much thanks.

VB, Maturin

Andy,

The Gmail IDs can be used to login into Yahoo, the Group settings allows for using a Gmail or a Yahoo email address as the primary one. My ID, now, is the Gmail one, and I can browse, reply, upload/download files.
What's confusing about Shigematsu-san is that he can login, post, view files, but not download them. Which is really strange, indeed.

Shigematsu-san, you said that you made another account and you could login and make changes, as well. You also said you want to change/modify your Yahoo ID. Combining these two togehter, why not delete that Yahoo account and then make another one the way you wanted? Or just use the newly created ones.


Vlad

Also, I have saved the .asc file in database for your reference which i have been using/trying to modify :flyback_nom.asc

--- In LTspice@..., "imbvlad" <imbvlad@...> wrote:

Hello

You may want to try the other Yahoo group, "switchmode", they may have the answers you're looking for.


Good luck,
Vlad

Hi,
i was thinking that the main component what i have used is of LT and so this group should be aiding me.

Thanks
Yoga

--- In LTspice@..., Andy <Andrew.Ingraham@...> wrote:

Getting back to the original question again ... (Is there a tool to
convert a SPICE model to a schematic?) ...

Two data points so far are:

- It might cost you $100K.

and

- None of them work well for Analog circuits.

I'd like to suggest that it might not be quite as bad as this. I
believe there are cheaper alternatives available. I ran across one a
while back (costing only around a thousand bucks?) that claims to be
able to do it. I am also led to believe that some academic research
work *might* be available for free, if you know where to find it.

As for quality, let's just say "your mileage may vary." Might be
acceptable, might be horrible, depending on the quality of the
program, and on the circuit you feed into it.

So I don't want to give you unrealistic hope ... but I also don't want
you to be so discouraged to believe that it is impossible either. As
I said earlier, converting to a schematic is NOT a trivial problem.
So far, this is one of those tasks that the human brain is much better
than a computer at doing well.

Regards,
Andy

Re: Netlist to LTspice schematic

As far as I know LTspice does not support a schematics to schematics conversion program, SO even if you love the schematics that you get by netlist conversion with whatever tool, you will not be able to move these schematics into LTspice automatically.

There is a common Electronics Design tool Interchange Format called (EDIF) which will allow EDIF to be used as an intermediate format however I've never heard of an EDIF=>LTspice schematics. I believe that the schematics tool on which LTspice schematics is based is now part of the "Laker" design tools package, unfortunately it underwent a major rewrite some years back so it is probably no longer compatible with LTspice (I know one of the changes was to make the schematic .asc file into a binary format).


BTW EDIF transfer hardly ever works properly because each schematic system has it's own quirks and preference for symbol size / drawing grid etc. not to mention funny constructs such as component loops (as supported in LTspice). These funny constructs do not have generic EDIF equivalents, so we re-enter by hand!

PPS: It is not by accident that no two design entry tools are really completely inter-operable. The big players like the tool Lock-In they get with incompatibility. Just to show you how cynical the industry is many tool vendors support and EDIF reader but hardly any supply an EDIF writer.

Hello again Shiggy-san,

I have already tryed the Yahoo ID asuming as mr.shigematsu@... and
mr.shigematsu.

But those are not Yahoo IDs!

"mr.shigematsu@..." is your Gmail address. "mr.shigematsu" is
your Gmail username. Both of them are for Gmail; they are not for
Yahoo.

Q1) Would you tell me the method of ascertain the yahoo ID.

Your Yahoo ID is what you picked when you originally signed up for
your Yahoo account. If you have a Yahoo email address, then you have
a Yahoo ID which is the part of the Yahoo email address before the "@"
symbol.

For example, if you have the email address "mr1.shigematsu@...",
then "mr1.shigematsu" would be the Yahoo ID for that email address.

But you might have more than one Yahoo ID (and I think you do). You
should use the same Yahoo ID that you used when you became a member of
the [LTspice] group. That is the Yahoo ID that gives you access to
the [LTspice] files.

I have tried it according to their instruction, I could not modify
it.(failure).
So I have already asked to Yahoo about modifing my profile(Yahoo ID and my
name).

I think it is not possible to modify a Yahoo ID. The Yahoo ID itself
is fixed and probably cannot be changed.

I hope I do not offend you, but I think most of the problems you are
having, are because of your understanding of English. It may be best
if you ask for help from a friend who knows English better than you
do.

Best regards,
Andy

Getting back to the original question again ... (Is there a tool to
convert a SPICE model to a schematic?) ...

Two data points so far are:

- It might cost you $100K.

and

- None of them work well for Analog circuits.

I'd like to suggest that it might not be quite as bad as this. I
believe there are cheaper alternatives available. I ran across one a
while back (costing only around a thousand bucks?) that claims to be
able to do it. I am also led to believe that some academic research
work *might* be available for free, if you know where to find it.

As for quality, let's just say "your mileage may vary." Might be
acceptable, might be horrible, depending on the quality of the
program, and on the circuit you feed into it.

So I don't want to give you unrealistic hope ... but I also don't want
you to be so discouraged to believe that it is impossible either. As
I said earlier, converting to a schematic is NOT a trivial problem.
So far, this is one of those tasks that the human brain is much better
than a computer at doing well.

Regards,
Andy

But there aren't many models or even internal schematics on the
internet.

On the contrary, there are thousands upon thousands of SPICE models on
the Internet!

Part of the difficulty is determining which ones are worthy of using
and which ones are not. For a popular IC component like a 741 or a
555, you could probably find literally hundreds if not thousands of
copies of SPICE models for them on the 'net, of which a few dozen are
distinct from one another; and then your job is to choose which one(s)
to run with.

Internal schematics, now there you may be correct that they are hard
to find on the Internet. It used to be (when an op-amp was about as
complex an IC as you could get) that equivalent schematics were often
included on the data sheet for the part. Of course the schematic
didn't show you the characteristics of the transistors and diodes, and
maybe omitted resistor values too, but at least it was a starting
point.

And I have seen and used a number of vendor-supplied SPICE models that
included schematics in the documentation that accompanied those
models.

Regards,
Andy

I wrote:

I think you misunderstood. The macro-model contains FAKE elements
that stand in for whole sections of transistors and stuff.

rainbowsally replied:

Understood. But they can be recreated using discretes. This truly
isn't a problem.

I hope I am neither offending, nor coming off sounding like a jerk ...
but I am still not sure you understand.

Let's say someone hands you a SPICE model for an IC, part number XYZ,
which you want to use in your circuit, and simulate in LTspice.

But being the curious type, you need to know what is in that model.
You want to see it visually in schematic form. So you spring for that
$100K conversion program which converts it into a schematic. And,
voila, it spits out a schematic consisting of:
a couple of voltage sources,
a few resistors and capacitors,
and a behavioral controlled source described by an equation.
Not a transistor in sight! In other words, it is one of those dreaded
"macro-models" that represents the behavior (rather than the
structure) of the XYZ part.

Sure, you could replace it or recreate it using discretes ... if you
knew what discretes to use! But you don't. All you have is the
macro-model. You know nothing else about the insides of this XYZ
part.

For that TLC555 that started this discussion, if the SPICE model you
have is one of these macro-models, then you might have no way to
understand why the input current is the same as it was for an old
NE555, even though the TLC555 is supposed to be a CMOS part.

Furthermore, it truly is a problem when the macro-model does not
accurately represent a certain behavior of the device that matters to
you. And that can easily happen.

Andy