Electronics > Beginners

Free circuit simulator ?

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Zero999:
I've used LTSpice for around ten years now and only recently had to RTFM. I learned most of it on my own and by opening files created by others, whether it be the examples included or those posted on forums, such as this one.

Lots of people find LTSpice difficult to use because it's different to other Windows applications, but it didn't bother me because I've used lots of GUI software on other platforms than M$: the Acorn Archimedes when I was much younger, then Windows and later Linux. I think having experience with using a variety of user interfaces helps one learn to use programs such as LTSpcie, which differ from the norm.

Another thing which beginners often struggle with is, LTSpice is not a real time simulator. The circuit is designed, the simulation run and the results shown. Many educational simulators aimed at beginners attempt to simulate a circuit in real time which has limitations, mainly that they have to be optimised for speed, over accuracy, as everything needs to happen fast enough to respond to the user's input.

Rerouter:
My go to is falstads circuit simulator, not as fully featured as spice, but for testing out concepts, its much faster to play with.

http://www.falstad.com/circuit/circuitjs.html

Cliff Matthews:
Any chance OP is left-handed? Docs show LTspice can move around keys.  http://ltwiki.org/index.php?title=LTspice_Hot_Keys

soldar:

--- Quote from: Zero999 on March 30, 2019, 09:11:53 pm ---Another thing which beginners often struggle with is, LTSpice is not a real time simulator. The circuit is designed, the simulation run and the results shown. Many educational simulators aimed at beginners attempt to simulate a circuit in real time which has limitations, mainly that they have to be optimised for speed, over accuracy, as everything needs to happen fast enough to respond to the user's input.
--- End quote ---

I have two main complaints. One is that it is not intuitive in finding components or doing actions. I waste a lot of time with this.

And then, once you have drawn the circuit you still have to run it and this is also confusing. You need to set some parameters and then click run and most of the time it goes into a calculating frenzy which goes nowhere and you have to tinker with the run parameters and try again.

Very not intuitive in many ways which makes it very slow.

Wimberleytech:

--- Quote from: soldar on March 30, 2019, 09:24:56 pm ---
--- Quote from: Zero999 on March 30, 2019, 09:11:53 pm ---Another thing which beginners often struggle with is, LTSpice is not a real time simulator. The circuit is designed, the simulation run and the results shown. Many educational simulators aimed at beginners attempt to simulate a circuit in real time which has limitations, mainly that they have to be optimised for speed, over accuracy, as everything needs to happen fast enough to respond to the user's input.
--- End quote ---

I have two main complaints. One is that it is not intuitive in finding components or doing actions. I waste a lot of time with this.

And then, once you have drawn the circuit you still have to run it and this is also confusing. You need to set some parameters and then click run and most of the time it goes into a calculating frenzy which goes nowhere and you have to tinker with the run parameters and try again.

Very not intuitive in many ways which makes it very slow.

--- End quote ---

Then don't use it!  Move along these are not the droids we are looking for.

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