True about the consistency of being aware of which install used for updates. So, one last question: If you choose the "Install for all users" option, is there an advantage over the "Install for me" option assuming you are consistent with both, and , if you are not consistent with your options, is their any negative consequences beside's the extra space used for application in Program files.
Thanks
Thanks
I had to read up on the differences and these are the links I posted over on the ADI Engineer Zone forum.
https://superuser.com/questions/173...m-files-to-manually-install-for-a-single-user
https://stackoverflow.com/questions/12427245/installing-in-program-files-vs-appdata
https://superuser.com/questions/173...m-files-to-manually-install-for-a-single-user
https://stackoverflow.com/questions/12427245/installing-in-program-files-vs-appdata
Hi Mr Mooly really sorry to disturb but i am very lost with FFT
I have tried to follow your very precious directions but i think i am doing mistakes with settings and actions
I would just like to get the 1kHz distortion spectrum and stop of the simple circuit attached below
Maybe i have entered values of components wrongly I see Farad for caps ???
Could you please me redirect to the relevant post in this thread where the passages to get a FFT are depicted ?
thank you very much indeed
Kindest regards
gino
I have tried to follow your very precious directions but i think i am doing mistakes with settings and actions
I would just like to get the 1kHz distortion spectrum and stop of the simple circuit attached below
Maybe i have entered values of components wrongly I see Farad for caps ???
Could you please me redirect to the relevant post in this thread where the passages to get a FFT are depicted ?
thank you very much indeed
Kindest regards
gino
Attachments
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A couple of things wrong
The AC input should be like this. You set your amplitude here and the '1' is a reference designator for that voltage source, its not an amplitude setting:
Set the sim to 'Transient' and set a suitable run time such as 100ms which would display 100 cycles at 1kHz. Set a 'Time to Start Saving Data' and it lets the sim run for that time before displaying the result.
Add a load resistor and you can also label the output. Also add the Spice Directives shown to set the 'window' for sampling:
And the FFT Right click the area with the trace and select FFT:
Select Vout as the node to view:
If you make the caps massive and run the sim longer you get a more detailed FFT. Make the electrolytics '1' which is 1 Farad and set the sim times for 1000ms and start saving data at 600ms:
Modified sim:
The AC input should be like this. You set your amplitude here and the '1' is a reference designator for that voltage source, its not an amplitude setting:
Set the sim to 'Transient' and set a suitable run time such as 100ms which would display 100 cycles at 1kHz. Set a 'Time to Start Saving Data' and it lets the sim run for that time before displaying the result.
Add a load resistor and you can also label the output. Also add the Spice Directives shown to set the 'window' for sampling:
And the FFT Right click the area with the trace and select FFT:
Select Vout as the node to view:
If you make the caps massive and run the sim longer you get a more detailed FFT. Make the electrolytics '1' which is 1 Farad and set the sim times for 1000ms and start saving data at 600ms:
Modified sim:
Attachments
I see nobody respone on mine last post, not a problem, but the new LTspice has problems, it conflict with brave and other software, it stops simulating when I set menu invisible., it give 0.3 procent total distortion when I get -100dB on fft, and pc hangs a lot when I try to open brave for watching internet.
I have now install the old one, and no problems at all.
And no, the pc is not to blame.
UPDATE! known problems, I have a update now, try again.
UPDATE again, I get 24.07 in stead of the newest version, how strange is this.
https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html
I have now install the old one, and no problems at all.
And no, the pc is not to blame.
UPDATE! known problems, I have a update now, try again.
UPDATE again, I get 24.07 in stead of the newest version, how strange is this.
https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html
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Good evening Mr Mooly and thank you very much for your extremely kind and valuable reply
I tried to follow your instructions and settings
I think i have set something wrong because i get an ugly looking fft (file .asc and jpeg of the fft attached)
I run your modified file and it is perfect
So there must be a problem with options setting and four 1kHz 10 4 v(vout)
I tried to follow your instructions and settings
I think i have set something wrong because i get an ugly looking fft (file .asc and jpeg of the fft attached)
I run your modified file and it is perfect
So there must be a problem with options setting and four 1kHz 10 4 v(vout)
Attachments
Last edited:
When an update to any program causes problems, one approach is to do a complete uninstall (including deleting the installation folder in Program Files) and then do a fresh install with the latest installer, which 24.0.12 in this case. A clean install can fix a lot of issues.UPDATE! known problems, I have a update now, try again.
UPDATE again, I get 24.07 in stead of the newest version, how strange is this.
This is interesting: Here is what I found:Good evening Mr Mooly and thank you very much for your extremely kind and valuable reply
I tried to follow your instructions and settings
I think i have set something wrong because i get an ugly looking fft (file .asc and jpeg of the fft attached)
I run your modified file and it is perfect
So there must be a problem with options setting and four 1kHz 10 4 v(vout)
1. The max timestep needs to be a (binary?) multiple of the signal frequency and "Number of data points in time" (defaults to 262144=2^18 in FFT dialog), ie something like {1/1k/4096}. Otherwise you get a bent bumpy ~noise floor. There does not seem to be a windowing function that works better than "none" with harmonic sampling.
2. Coupling capacitors need to be huge, ie 1 farad. Otherwise, you get a slanted noise floor that rises on the left low frequencies. But using too large a value (~100) causes some kind of math problems and all the detail is wiped out, straight line.
Hope this is useful.
3. A huge time sample is unnecessary. 100mS vs 1S is fine.
OBTW, your version of cfp.asc has two R3's so I changed one to R6.
Attachments
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