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Re: A three Phase question please

 

Thank you sawreyrw


That really solved that one. I am glad that it is a simple fix :)



Thank you John?


For confirming what I thought was correct. :)


Thank you?Jerry Lee Marcel


For also confirming another rule of life :)

Suusi M-B
Re: A three Phase question please

John Woodgate
 

In message <l8vch8+10ue8vj@...>, dated Thu, 19 Dec 2013,
smalcolmbrown@... writes:

The question is is the lopsided waveform between ~A and ground an
accurate representation of a winding connected across a?

across any two of the phases?
There should not be a 'lop-sided' waveform anywhere. Whatever you do
with adding and subtracting sine-waves of the same frequency but
whatever phase, the result is another sine wave or zero.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Re: A three Phase question please

 

Suusi,


What is happening is the voltage across the primary is not 0 at time=0, so you have a huge primary current at time=0.? Due to the long time constant it takes a long time for the primary imbalance to settle out.? You can avoid this problem by specifying UIC is the transient command.? Check Skip Initial operating point solution in the .tran window.


Rick
OT test

 

Sri, just a test, i don't see my messages.
Rudi

---
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Re: A three Phase question please

 

¿ªÔÆÌåÓý

What do you mean "lopsided waveform"?
The traces I see are perfectly correct.
Indeed you can't take what happens at time-zero for granted, it could never happen in real life. Nature hates discontinuity.

Le 19/12/2013 19:05, smalcolmbrown@... a ¨¦crit?:

?

The question is is the lopsided waveform between ~A and ground an accurate representation of a winding connected across a?

across any two of the phases?

?

I was under the impression that the output was supposed to be symmetrical. That said it just an assumption, As I have not?dared put an oscilloscope on to the three phase to check. Or for that matter had access to the three phase either.


The file is in Files > TEMP >?3 Phase question > 3 phase query.asc


Any enlightenment and or help will be gratefully received. Thank you


Suusi M-B
A three Phase question please

 

The question is is the lopsided waveform between ~A and ground an accurate representation of a winding connected across a?

across any two of the phases?

?

I was under the impression that the output was supposed to be symmetrical. That said it just an assumption, As I have not?dared put an oscilloscope on to the three phase to check. Or for that matter had access to the three phase either.


The file is in Files > TEMP >?3 Phase question > 3 phase query.asc


Any enlightenment and or help will be gratefully received. Thank you


Suusi M-B
Re: [OT] Re: LTspice Install problem under linux

Business Kid
 

This problem in the topic is long solved, but . . .

The last windows I ran and maintained was windows 98. If one reinstalled or updated like that, junk seemed to collect, such that such that one smartalec explained windows as "Will Install Needless Data On Whole System."
I parted company with win98 & the BSOD about 2006. But I do believe windows does many things well these days, and one or two much better than linux (Graphics, for instance). I half liked XP and windows 7, but when I was buying laptops, they stuck me with vista and windows 8 :-((. Not much encouragement, I think you'll agree.



On 19 December 2013 15:08, Philippe Basier <basier.philippe@...> wrote:
?

Hello Business Kid,
?
You wrote:
¡°... that was a great way to clog up a registry with junk,
and end up with random files on your drive.¡±
?
I¡¯m not interested in Unix problems for many years.
But:
1/ How was it :
??? a ¡°...a great way to clog up a registry with junk¡± ?
?
2/ and why :
?? ¡° [that] end up with random files on your drive ¡° ?
Regards,
Philippe Basier.
?
Sent: Thursday, December 19, 2013 10:34 AM
Subject: Re: [LTspice] Re: LTspice Install problem under linux
?
?

> I have never EVER gotten the LTSpice web update to work in Linux, in any
> distribution. It may have worked a long time ago, but I just download the new
>.exe when I want to update.
>

It's the sort of thing I wouldn't try, as that was a great way to clog up a registry with junk, and end up with random files on your drive. Windows has got less inefficient, but old habits die hard.


--- In LTspice@..., wrote:
>
>
> I have never EVER gotten the LTSpice web update to work in Linux, in any distribution. It may have worked a long time ago, but I just download the new .exe when I want to update.
>

?

?
Re: Membership renewal problem ....

 

for aurora_viii,

I did, and the administrator merged my complaint to an existing
similar complaints (a lot, not just my) on their website. That means,
it is not a scam, it is a real issue. ... How I mentioned in my previous
e-mail? I could activate my membership throgh my second e-mail
address, sbcglobal. Now, everything is okay.

Thanks,
Peter
Re: Membership renewal problem ....

 

Martin,

Not really, I could not access to the group anymore through my old yahoo account. But I could activate my group's membership through
my existing sbcglobal account ... Thanks for advices guys.

Merry Christmas ...
Peter
Re: Odd behaviour when attempting to simulate an LTC3633 switching regulator.

 

I do not understand how a 1uH can be too large.? according to the formula provided in the datasheet (for an output current ripple of ~40):

l=(vout/(f*ripple curent))*(1-(vout/vin))
l=(1.1/(4*0.039))*(1-(1.1/12))
l=6.39uH

Can anyone shed some light on this?
Re: LTspice Install problem under linux

 

¿ªÔÆÌåÓý

Hello Business Kid,
?
You wrote:
¡°... that was a great way to clog up a registry with junk,
and end up with random files on your drive.¡±
?
I¡¯m not interested in Unix problems for many years.
But:
1/ How was it :
??? a ¡°...a great way to clog up a registry with junk¡± ?
?
2/ and why :
?? ¡° [that] end up with random files on your drive ¡° ?
Regards,
Philippe Basier.
?

Sent: Thursday, December 19, 2013 10:34 AM
Subject: Re: [LTspice] Re: LTspice Install problem under linux
?
?

> I have never EVER gotten the LTSpice web update to work in Linux, in any
> distribution. It may have worked a long time ago, but I just download the new
>.exe when I want to update.
>

It's the sort of thing I wouldn't try, as that was a great way to clog up a registry with junk, and end up with random files on your drive. Windows has got less inefficient, but old habits die hard.


--- In LTspice@..., wrote:
>
>
> I have never EVER gotten the LTSpice web update to work in Linux, in any distribution. It may have worked a long time ago, but I just download the new .exe when I want to update.
>

?
?
Switch ... on - Switch... off

 

I cannot understad the functionality of this statements. Nothing from help, could someone explain that?
Many thanks, Enrico
Uploading Models - Love some help with one.

Business Kid
 

I am uploading 2 HEMT models which I am using for the benefit of others.


The ATF34143:


And the single supply ATF54143. They contain nothing that I haven't garnered from? Avagotech's site and I don't view them as intellectual property of mine.



They may help others trying to work with these unusual devices.
Their status is:
ATF34143: Fully an Avagotech model. tried only briefly.

ATF54143. Slightly iffy. The drain/source seems to model well, in line with my hardware prototype.? The gate models well, but shows strange voltages with a source resistor in circuit.

To be specific, +0.6V should be across the gate with the device midway on. But Add a 10 ohm source resistor and it's possible to see negative voltages on the gate. Instead of being stepped UP by about 0.5V (lost across the resistor) it seems to be stepped DOWN, i.e. negative. So LTspice models it with the gate more negative than the source (where it should be off) but it isn't off.

This was taken from the ATF34143 and adjusted (imperfectly, I guess) from the datasheet simulation figures.
Re: VCO tuning curve

 

Many thanks Helmut. Your answer helped me a lot.


On Thursday, December 19, 2013 1:58 PM, "helmutsennewald@..." <helmutsennewald@...> wrote:
?
Hello Ahmed,

You could use .step and .MEASURE commands to get the frequency versus voltage.
The results of MEASURE will be saved in the errorlog-file(.log). Then right mouse click in this file to plot the results.

Examples with MEASURE are available in the Files-section of this group.

All Files > Tut > Measure

http://groups.yahoo.com/neo/groups/LTspice/files/%20Tut/MEASURE/TRAN/


Best regards,
Helmut
Re: VCO tuning curve

 

Hello Ahmed,


You could use .step and .MEASURE commands to get the frequency versus voltage.

The results of MEASURE will be saved in the errorlog-file(.log). Then right mouse click in this file to plot the results.


Examples with MEASURE are available in the Files-section of this group.


All Files > Tut > Measure


http://groups.yahoo.com/neo/groups/LTspice/files/%20Tut/MEASURE/TRAN/



Best regards,

Helmut
Re: Membership renewal problem ....

 

+1 for phishing scam. Send a copy of the email to yahoo help, subject 'phishing email' or 'spoof email'

?

No Internet set-up needs a 'phone number that I've heard of, and no don't give out your 'phone numbers on the net, unless you like receiving lots of cold calling type calls?:D

?

Ditto e-mail addresses, or have one specially set up, if you must supply one, to get all the junk stuff

?

HTH

?
LTSpice FFT resolution

 

Hello all,

What is the theory behind selecting the right max time step for FFT analysis?

I always assumed that the max time step should be selected depending on the highest frequency resolution one might desire from the FFT.

However, I noticed that I need to further reduce the max time step to avoid artifacts which appear as higher order harmonics.

To analyse a simple audio circuit, I typically use a 1 kHz sine input signal, run a? transient (duration = 300 ms, max time step = 10 us).

I checked my simulation setup with a simple circuit (2 voltage sources in series with a resistor, 1st source 1 kHz and second source 4 kHz). I observed that I have to reduce the max time step to at least 2 us in order to keep the artifacts below 130 dB.

I would be very interested to better understand the theory behind!

Thank you in advance,
Jos
Re: LTspice Install problem under linux

Business Kid
 

> I have never EVER gotten the LTSpice web update to work in Linux, in any
> distribution. It may have worked a long time ago, but I just download the new
>.exe when I want to update.
>

It's the sort of thing I wouldn't try, as that was a great way to clog up a registry with junk, and end up with random files on your drive. Windows has got less inefficient, but old habits die hard.


On 18 December 2013 20:45, martin562284 <martin.sadler@...> wrote:
?

It's always worked fine for me - various versions of Ubuntu and Mint



--- In LTspice@..., wrote:
>
>
> I have never EVER gotten the LTSpice web update to work in Linux, in any distribution. It may have worked a long time ago, but I just download the new .exe when I want to update.
>
Re: Membership renewal problem ....

martin562284
 

This sounds more like a phishing scam. I can't recall ever being asked to renew my membership to any Yahoo groups - some have lay dormant for many years but I can still access them.

There is an apparent contradiction in your message below - you state that you are not a member and yet you are able to post a message - more evidence that the e-mail I presume you received purporting to be from Yahoo is in fact a phishing scam.

--- In LTspice@..., Peter Kapas <pkapas@...> wrote:

In last days I faced to a problem to renew my LTspice group's membership. Simply, I am
not a member right now, because Yahoo canceled my account, like inactive (?) and for
renewal is asking for a cell-phone number (for verification ?) What happens, if some one
has no cell-phone, or does not want to by a new one just for that reason. Honestly, I do not
want to give out my cell-phone number for the public, for future selling it for advertisement
reason, how the companies frequently do it. How to become again a LTspice member? ...
Why do I mention it? So, if I read reactions, "see ... this and this letter/folder on the LTspice
group's website" I doubt I will be able to do it in future or other with same problem.
Is there a different way to enter into this group's website?

Thanks,
Peter
Re: I don't remember the procedure...

 

¿ªÔÆÌåÓý

Hi Vlad,

Thank you for your quick reply.
The "tip" is the Ctrl-right-click to be able to rename with a "X" !
All is running 100% now.

Best regards and a Merry Christmas,

Rudi

On 18.12.2013 17:56, imbvlad@... wrote:
?

Hello


I see that it's a subcircuit. In this case, if you want to use the symbol for PMOS, then Ctrl-right-click on it, rename MP to X and then rename PMOS to IRLML5103. Of course, having the subcircuit's text as a SPICE directive on the schematic or in a custom library is necessary.



Merry Christmas to you, too

Vlad




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