NI multisim - Page 1
Forum section: electronics / beginners

author: glinjik
author_rank: Regular Contributor
timestamp: April 22, 2022, 10:53:20 am
content: Hi trying to simulate the schematic before I build it but can't get it to function correctly please can one of the experienced people have a look see where I'm going wrongsorry, had to zip it msi files not allowed

author: glinjik
author_rank: Regular Contributor
timestamp: April 23, 2022, 07:23:46 pm
content: wow, post 83 viewsschematic 27 viewszip downloaded 7 timesAnd not one answer.One begins to wonder the point of being on this forum

author: Benta
author_rank: Super Contributor
timestamp: April 23, 2022, 08:04:40 pm
content: Quote from: glinjik on April 23, 2022, 07:23:46 pmPerhaps your location has something to do with it.Just sayin'

author: ledtester
author_rank: Super Contributor
timestamp: April 23, 2022, 09:30:44 pm
content: Quote from: glinjik on April 23, 2022, 07:23:46 pmIt would be extremely helpful if you were more specific about what the problem is. What is your test set up? What did you expect? What did you get instead?I don't have Multisim (is there a free version?) so I can't see what your circuit looks like but in both hardware and software engineering it helps to find the simplest example which doesn't work. I would first start by using ideal components -- ideal voltage sources, op-amps, transistors. Replace sections of the circuit with their ideal equivalents. Start with a single op-amp in the control loop and add the others one by one. When the circuit works with ideal components you can start replacing them with the real-world devices.LTspice is a freely available circuit simulator and I see a lot of people here use it. Perhaps if you provided a LTspice schematic you'd get more interest.Updated:Also note that in some parts of the world this is Easter weekend.

author: themadhippy
author_rank: Super Contributor
timestamp: April 23, 2022, 10:01:16 pm
content: Quotethought that was last weekend

author: ledtester
author_rank: Super Contributor
timestamp: April 24, 2022, 12:01:34 am
content: You're right! doh!Well -- Orthodox Easter is this weekend so my brain wasn't misleading me too much!

author: glinjik
author_rank: Regular Contributor
timestamp: April 24, 2022, 05:12:14 am
content: My location and politics has nothing todo with an electrical forum just saying I'm actually English but happen to live in Russia

author: eugene
author_rank: Frequent Contributor
timestamp: April 24, 2022, 01:08:08 pm
content: Only a fraction of EEVBlog members use Multisim, so not many of us are able to load your document to try it.

author: bostonman
author_rank: Super Contributor
timestamp: April 24, 2022, 04:10:46 pm
content: Can you save it as older version? I have version 12 and it won't let me load this file.

author: Zero999
author_rank: Super Contributor
timestamp: April 24, 2022, 05:09:21 pm
content: Quote from: glinjik on April 23, 2022, 07:23:46 pmMost people here use LTSpice, for simulation, because it's a free download, saves files in plain text and is a very accurate simulator, with lots of features. Few are put off because of the current political situation, which is more complicated than the narrative, err I mean propaganda, pushed by the mainstream media.

author: glinjik
author_rank: Regular Contributor
timestamp: April 24, 2022, 06:57:53 pm
content: Quote from: bostonman on April 24, 2022, 04:10:46 pmi will not get into political discussions of any type here

author: glinjik
author_rank: Regular Contributor
timestamp: April 24, 2022, 07:02:57 pm
content: Multisim files are not backwards compatible. For example, a file created in version 13 cannot be open in version 12 or previous, and there is no option to save files as a previous version.On the other hand Multisim is forwards compatible, this means you can open older files in newer versions. For example, you can open a version 10 file in Multisim 13, regardless of the versions. Therefore it is also possible to open 14.1 files in Multisim 14.2.The same rules apply to Ultiboard files.

author: glinjik
author_rank: Regular Contributor
timestamp: April 24, 2022, 07:10:03 pm
content: well i did try getting ltspice but result below

author: Benta
author_rank: Super Contributor
timestamp: April 24, 2022, 07:52:41 pm
content: Quote from: glinjik on April 24, 2022, 07:10:03 pmOh dear! That's how sanctions work, though.

author: Zero999
author_rank: Super Contributor
timestamp: April 24, 2022, 09:03:22 pm
content: The problem with sanctions is they harm everyone.Quote from: glinjik on April 24, 2022, 07:10:03 pmIt's mirrored on filehippo. If that doesn't work. Send be a private message and I'll email it to you.https://dl5.filehippo.com/e75/411/af79270bc868d8962259a0fe983f7089d9/LTspice_win_v17.0.22.0.exe?Expires=1650877090&Signature=8591bf0194ea6d37d6f1c4780fbf170079da119c&url=https://filehippo.com/download_ltspice/&Filename=LTspice_win_v17.0.22.0.exe

author: CaptDon
author_rank: Super Contributor
timestamp: April 25, 2022, 04:43:22 pm
content: If it is a schematic of a functioning power supply why simulate it before building it? Was the schematic a ripoff of someone's working design? It sure has a shit load of parts in it. Probably has piss poor transient load response?

author: glinjik
author_rank: Regular Contributor
timestamp: April 25, 2022, 04:58:55 pm
content: Quote from: CaptDon on April 25, 2022, 04:43:22 pmNo its an original from Russian forum this is its 16th version many people have built it and I also will build it but wanted to simulate it, its original name пидбп is forum is closed down now but the archive is still online you can use Google Translatehttps://radioskot-ru.translate.goog/forum/3-7758-1?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=ru

author: Zero999
author_rank: Super Contributor
timestamp: April 25, 2022, 05:28:46 pm
content: Quote from: glinjik on April 25, 2022, 04:58:55 pmDid the link I posted above work for you?Simulating a linear power supply can be quite tricky because there's a thermal element to the design, which can also be simulated but is tricky to get right?