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Old 21st September 2011, 10:31 PM   #191
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The default directory of LTSpice is the same as the executable. The files should be there unless you saved them elsewhere.

A word of caution. I found that LTSpice did not always keep the "do not save RAW files" option, and as a result it will rapidly fill up your entire disk space with old RAW files. So every once in a while you should check the size of the directory and delete all RAW files and FFT files.

Good luck,
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Old 22nd September 2011, 12:37 PM   #192
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Thx guys. I got a tip from Linear to turn off the 'User access Control' and after an update it seems to work. Except that after the update it appears my previous schematics are now deleted. No biggie since I only had a few test circuits drawn up.
I'll join the LTSpice group for sure, thanks.
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Old 25th September 2011, 04:10 PM   #193
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by dchisholm View Post
- Select "Organize" > "Folder & Search Options"
- On the "General" tab, select "Show all folders" > "Apply"
- On the "View" tab, un-select "Hide extensions for known file types"
- Un-select "Hide protected operating system files"
(Yeah this makes it easier to do something stupid - like delete the O.S.)
- Select "Show hidden files, folders, and drives.
(May not be necessary. Sometimes the Installer seems to mark things as "Hidden" for no obvious reason.)
- Click "Apply", then "Apply to Folders"
it all works to your instructions to (2) apply.
Step(3) apply to folders is not active. It is greyed out.

Do I have to switch on some other control?
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Old 26th September 2011, 03:43 AM   #194
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Quote:
Originally Posted by AndrewT View Post
Do I have to switch on some other control?
I don't know the answer, Andrew. It's posible. The images attached to my post are screen-shots direct from my machine, so you can see what I was looking at.

I know next to nothing about the "Security" features in Win7 - especially the classes of "Administrators" and "Users" - and I might speculate they are restricting the options allowed to different account owners.

Dale
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Old 26th September 2011, 09:11 AM   #195
AndrewT is offline AndrewT  Scotland
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Thanks Dc.
I went in this morning after a cold boot and the option "apply to folders" was active.
Selected and saved.
Thanks again
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Old 26th November 2011, 10:54 PM   #196
Irakli is offline Irakli  United States
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Hi All,

Can anybody point me to the reference what "Damped Pseudo-Transient Analysis" is and how LTspice implements it?

"Damped Pseudo-Transient Analysis" is the first thing LTspice does when it starts .tran analysis.

There is nothing in the Help or Manual.

Thanks
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Old 26th November 2011, 11:09 PM   #197
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My guess it that it provides a best-guess operating point solution for circuits where the operating point is not straightforward to guess, such as a circuit which does not reach it's operating point naturally, but needs a time constant or relay to activate the circuit when it is ready to operate. However this is just my guess. You should probably ask on the LTSpice Yahoo group about this.

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Old 27th November 2011, 01:15 AM   #198
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Quote:
Originally Posted by Irakli View Post
Hi All,

Can anybody point me to the reference what "Damped Pseudo-Transient Analysis" is and how LTspice implements it?

"Damped Pseudo-Transient Analysis" is the first thing LTspice does when it starts .tran analysis.
Yes, the LTSpice Yahoo group is definitely the best place to ask the question.

Does this concern you about a particular circuit? LTSpice has several tactics available for finding an initial solution from which a transient analysis can proceed. There may be some characteristic of your circuit that guides LTSpice to use "Damped Pseudo-Transient Analysis". In my experience it is better at finding initial solutions than any other low-cost or no-cost circuit simulator.

Dale
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Old 3rd December 2011, 10:18 PM   #199
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Damped Pseudo-Transient Analysis is the last method it uses to try to find the DC operating point. This method is only used in very difficult circuits, and it means you have some very poorly behaved models.
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Old 4th December 2011, 02:22 AM   #200
Irakli is offline Irakli  United States
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Quote:
Originally Posted by sawreyrw View Post
Damped Pseudo-Transient Analysis is the last method it uses to try to find the DC operating point. This method is only used in very difficult circuits, and it means you have some very poorly behaved models.
Thanks. My understanding now is that program first tries to determine DC operating point, then does Gm stepping, then does source stepping and finally PTA is performed if all previous methods fail.
I found some info about Gm and source stepping but nothing about PTA. Would like to know at least in general what is the basis of the method.
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