开云体育

Shigematsu-san,

Did you try to scan for viruses, clean up your temporary internet files and cookies, a different browser? I am sorry but there's not much I can do. I am not a moderator, nor a Yahoo employee.


Vlad

I saw your question yesterday too (I think it was yours). I am very
confused by your question, because I do not understand exactly what
you are trying to do and why you are having those problems.

There are no "3 steps" to access the LTspice files from this [LTspice]
group on Yahoo!groups. These "3 steps" are unfamiliar to me (and
probably to most people here in this group).

No email address is needed to access the files either.

So, I am guessing that there may be something on your end, perhaps
enforced by your ISP (Internet service provider, the company that
gives you access to the Internet), which is blocking you from going
anywhere on the Internet. Do you have similar "3 steps to Access", or
similar problems, getting to other places on the Internet?

Either that, or your computer is infected with a Virus, and it is blocking you!

When I want to download LTspice files, I open up a web browser window
and I go to the group's Files area:



and then I navigate down to the sub-folder I want. Or I just go to
the sub-folder directly ... such as:



Then I select the xxx.asc file that I want. In most web-browsers, if
you right-click on the xxx.asc filename, you can then select a choice
to Save the file. (In my web browser, I select "Save link as..." and
then it saves the file.) There should NOT be any 3 Steps to Access
the file. So I am really confused what it is you are doing, which is
causing those messages to appear.

You do need to be "logged in" to Yahoo!Groups first, to access any of
the files in this group. But you would not be able to even see a
xxx.asc file if you are not already logged in.

I hope this helps a little. I really hope your computer does not have
a virus which is causing those problems.

Regards,
Andy

Hi vlad-san!

Sorry for may frequently question.

When I have entered my email address to access the Files of LTspice, bellow
message happen.
-------------------------------------------------------------------------------
You are trying to add an email address that has been blocked by the email
address owner.
Please enter a defferent address.
-------------------------------------------------------------------------------
Q1) Can you tell me the method of unblocking the email address?

My address was blocked by a accident or my mistake, I think.

Shiggy



2012/8/29 重松宏昌 <mr.shigematsu@...>

Hi Vlad-san!

I am very happy, because I have a communications with you.
I will consider every possibilities, I think.
I must say thanks to your knowlege, your honesty.

About near the attached file, I can not go ahead or finish the "Get Web
Access to LTspice".

Any way, thanks your e-mail.

Shiggy





2012/8/29 imbvlad <imbvlad@...>

**


Shigematsu-san,

That seems strange, indeed. If you're sure you don't have some virus, try
cleaning your temporary files and cookies, Java related ones, too (there
should be an applet in the Control Panel), or try a different browser.
Another solution is to make another Yahoo user and register with that one,
see if it works. You may also want to call some friends and ask them if
they get the same thing. I'm sorry, but that's about all I can suggest
right now.

Good luck,
Vlad

[Non-text portions of this message have been removed]

Shigematsu-san,

That seems strange, indeed. If you're sure you don't have some virus, try cleaning your temporary files and cookies, Java related ones, too (there should be an applet in the Control Panel), or try a different browser. Another solution is to make another Yahoo user and register with that one, see if it works. You may also want to call some friends and ask them if they get the same thing. I'm sorry, but that's about all I can suggest right now.


Good luck,
Vlad

Hi Vlad-san!

Thanks your quick response!

When I try to down load the xxx.asc file from the File&#92;Temp directry of
LTspice.

LTspice or Yahoo site ask me to press "Get Web Access" To LTspice.

So I press the "Get satart now" button.
The following page, there is 3 steps to Access Ltspice File.
But I can not finish or complete the this 3 steps.

note) I am not good at English, I can not completely understand the English
statement of the site.
And almost of Japanese people is the same levels, I think.

Shiggy



2012/8/29 imbvlad <imbvlad@...>

**


Hello

Do you mean the program itself doesn't work, or the website?

Vlad

[Non-text portions of this message have been removed]

Hello

Do you mean the program itself doesn't work, or the website?


Vlad

monettsys wrote:

--- In LTspice@..., rainbowsally<rainbowsally@...> wrote:

Here's how to run ltspice on your windows partition from your linux
partition.
Go here.

Get this. HOW-TO-SCAD3-IN-LINUX.zip

Is there any reason you don't simply install LTspice using Wine?

Yeah. Didn't know you could do that. :-)

And I'm using dialup and only my widows modem works.

Good info tho. Thanks.

Maybe I'm misunderstanding what you are doing, but whenevr I need to run LTspice in Ubuntu, I simply download the latest executable and tell Wine to install it. I usually put it in C:&#92;SWCADIII in the Wine folder.

Everything goes exactly the same as in WinXP. There is no need to convert line endings, and I can copy ASC and PLT files back and forth from XP running in VirtualBox to LTspice running in Wine.

The only thing is I don't know where Mike puts the SCAD3.INI file when running in Wine. He moved it from C:&#92;WINDOWS to solve a permissions problem in Win7, and I haven't had the occasion to reinstall LTspice so I don't know where it goes now.

Mike

I'm working on cleaning up the libraries. It's MUCH easier to drop down to a terminal and get all the utilities in the world in linux. Windows is like "hands off, ye peasants!" and everything takes ten times as long.

I'll get high speed internet someday but we were supposed to have fiber optics for all our telephones about ten years ago and instead the telecomm companies decided (after Congress agreed to let them overcharge us $5 a month for caller id which only costs them 5 cents) to run our communications through sattelites where they can get knocked out by terroristas or even a big solar flare, but then that's not really what we were talking about, I guess.

The libraries are mixed case, difficult to read, parameters aren't in any particular order, so picking a transistor or a diode in the parts selectors is basically impossible.

It's not a problem when running other folks 'asc' files, but it's murder when you want to find a part and check on its price when you're designing from scratch.

Maybe an opamp could do it, but we'd need to see the kind of power it's expected to handle. But positive feedback (less than unity) could be used to increase impedance similar to the way an inductor works, but with capacitors. Still... that's a huge dynamic range.

John Woodgate wrote:

Hi Everyone!

I have tried to File of LTspice.

Get Start now button appears but I can not access the File of LTspice.

If you give me any information, I am very happy.

Shiggy

Hello Summer,

There are examples with different Laplace sources. Please check it.

Files > Tut > Laplace Sources > rl_ind_laplace.asc



Best regards,
Helmut

In message <k1jfi6+3mtl@...>, dated Tue, 28 Aug 2012, coldcolor0317 <coldcolor0317@...> writes:

The inductance is also a frequency dependent component. Yes, I understand if it'snot air-core, there are many other factors.But that's what we want to achieve, to include the turn-to-turn capacitance, turn-to-housing capacitance, and leakage resistance etc. I used other EM software to compute the L, then trying to match it with an equation variable freq), then connect with driving circuit.

I hope you succeed, but I don't think your approach is correct. In saying that 'the inductance is frequency-dependent' I think you are confusing measured values with the elements of the model. Also, you need to be clear whether you are going to model losses as a parallel resistor, a series resistor or both (or perhaps something more complex). Inductors don't have anything normally called 'leakage resistance'.

If that wasn't enough, a practical inductor that has significant impedance at 100 Hz will self-resonate well below 10 MHz unless you take truly heroic constructional measures to control capacitance.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Hello John,

The inductance is also a frequency dependent component. Yes, I understand if it'snot air-core, there are many other factors.But that's what we want to achieve, to include the turn-to-turn capacitance, turn-to-housing capacitance, and leakage resistance etc.
I used other EM software to compute the L, then trying to match it with an equation variable freq), then connect with driving circuit.

Regards

Summer

Hello Helmut:

Thanks so much. I downloaded your model and tried in my circuit model. I think it worked. Of course the expression needs to be refined.
So I take it that for inductance, if it's L=4u*(freq/2.5e6)^(-0.5),
then when I use G2 (voltage controlled current),
I should define the value as Laplace=1/(S*L),
is it correct?
In a similar way, capacitance can be defined as well.

Best regards

Summer

Here's a short (but very realistic) subcircuit for a filament type
lamp that has been written for optimum convergence performance in
LTspice:

* Two Pin Incandescent Lamp Model
*
* input: Kc = conductance constant of filament
* input: Kr = radiation constant of filament
* input: CTf = filament thermal capacitance
* input: RTf = filament thermal resistance
* n = numerical dynamic range scale factor
* Cf = filament conductance
* Pf = filament power (electrical input)
* Pr = radiated power (electromagnetic output)
* Tf = filament temperature (in degrees K)
* Ta = ambient temperature (converted to deg K)
*
.subckt Lamp 1 2 params: Kc=120 Kr=.7p CTf=5m RTf=10k
.param n=1m Ta=temp-kelvin ; internal parameters
BCf 1 2 I=V(1,2)*Kc/V(Tf)**1.2
BPf 0 Tf I=V(1,2)*I(BCf)*n
BPr Tf 0 I=Kr*(V(Tf)**4-Ta**4)*n
Cfa Tf Ta {CTf*n} Rpar={RTf/n}
VTa Ta 0 {Ta}
.ends Lamp

It goes fast even with n=0.1 for 325V, lower values seem to take their (minor) toll for longer simulation runs without imposed timestep.

Vlad

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

In message <k1j3en+ith9@...>, dated Tue, 28 Aug 2012, coldcolor0317 <coldcolor0317@...> writes:

Thanks so much for the response. I do want to simulate an AC analysis from 100Hz to 10MHz. The coil is essentially an inductor with a certain value. There's AC resistance too. SO R is increasing with freq, and L is decreasing with freq. I need to model this behavior.

Is this an air-cored inductor? If not, you will have a virtually impossible task to simulate it over that frequency range. It won't be at all easy even if air-cored, because of inter-turn capacitances, current crowding and maybe other factors.

If you want help, holding out on us with 'a certain value' isn't the way to get it.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

--- In LTspice@..., "afhockey623" <jxm1092@...> wrote:

--- In LTspice@..., "Helmut" <helmutsennewald@> wrote:

--- In LTspice@..., "afhockey623" <jxm1092@> wrote:

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

--- In LTspice@..., "afhockey623" <jxm1092@> wrote:

Is this an error? I just started using LTspice and I'm trying to use a circuit with an LT1210 and it shows two + supply inputs instead of the usual + and - supply inputs. Thanks gentlemen.

Hello,

Yes, the lower + terminal should be marked -. The models "test circuit" show a negative supply connected to that pin.

Rick

With the circuit I have though no matter how I position the power supplies I am not getting the expected output so I'm not sure if this part is broken or if I need to position them a certain way and that there is actually errors in my circuit.

Hello,

Maybe something else is setup wrongly fro LTspice.
If you upload your circuit, we might help you.

Best regards,
Helmut

Hi,

I was able to figure it out by opening up the test fixture for the op-amp. Do you know why the put an 11 Ohm resistor on the output of the opamp?

Hello,

The original circuit is on page 1 in the datasheet.

It has a 1:3 transformer driving a 100Ohm transmission line. We
have then an input impedance of 100/3^2=11Ohm on the primary side.
Using a 11Ohm series resistance is a perfect match of this
impedance.
Maybe they removed this transformer in the jigs-example to allow
to simulate the response down to DC.

Best regards,
Helmut

--- In LTspice@..., "coldcolor0317" <coldcolor0317@...> wrote:

Vlad:

Thanks so much for the response. I do want to simulate an AC analysis from 100Hz to 10MHz. The coil is essentially an inductor with a certain value. There's AC resistance too. SO R is increasing with freq, and L is decreasing with freq. I need to model this behavior.
Would you please specify more on how to do it?

Many thanks,

Summer

Hello Summer,

The formula with FREQ doesn't work. You should use a Laplace
function. Below is an example using a G-source.

Laplace=1/(0.95*(s/(2*pi*2.5e6))**0.3+0.1)

I have uploaded an example.

Files > Temp > freq_dep_res.asc

Best regards,
Helmut

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

Hello

R=0.95*(FREQ/2.5e6)^(0.3)+0.1.

This is the way to do it in LTspice, too, unless you want an .AC analysis. If "freq" is some external source, v(freq), it will work. You may need to add curled braces, though.


Good luck,
Vlad

--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:

--- In LTspice@..., "afhockey623" <jxm1092@> wrote:

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

--- In LTspice@..., "afhockey623" <jxm1092@> wrote:

Is this an error? I just started using LTspice and I'm trying to use a circuit with an LT1210 and it shows two + supply inputs instead of the usual + and - supply inputs. Thanks gentlemen.

Hello,

Yes, the lower + terminal should be marked -. The models "test circuit" show a negative supply connected to that pin.

Rick

With the circuit I have though no matter how I position the power supplies I am not getting the expected output so I'm not sure if this part is broken or if I need to position them a certain way and that there is actually errors in my circuit.

Hello,

Maybe something else is setup wrongly fro LTspice.
If you upload your circuit, we might help you.

Best regards,
Helmut

Hi,

I was able to figure it out by opening up the test fixture for the op-amp. Do you know why the put an 11 Ohm resistor on the output of the opamp?