[sdiy] Qspice, anyone tried it?

[Jonatan Liljedahl]

I use KiCad with the built-in ngspice integration. (I even contributed some
to the signal viewer code in KiCad :)

You don't need to use any special symbol for ground, or any other
component. The standard ground symbols map to net 0 already, as far as I
know. The bundled spice symbols are ugly and weird, so I never use them
except for the voltage source etc. Just set up the correct model on any
symbol with a matching pin count and all is well! One thing to look out for
is that the pin ordering for diodes are reversed in kicad and ngspice, and
also most transistors.

/Jonatan
http://kymatica.com


On Sun, 29 Dec 2024 at 21:18, Ben Stuyts via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Totally different UI's for LTspice and KiCad of course. I hate the UI in
> LTspice because the complete toolbar is missing on the Mac version. Adding
> models to ngspice in Kicad is pretty simple: Open the properties of the
> regular symbol, add simulation model and browse to e.g. the downloaded
> pspice model from TI. No messing with creating a symbol like in LTspice.
> You have to remember to use the Spice symbols for your ground, and I always
> forget that.
>
> I have never compared the results between these two, could be interesting.
> With regards to UI, KiCad is the clear winner. But you need to learn a new
> tool (ngspice), which prevented me from using it for the longest time. :-)
>
> It looks like ngspice is actively developed, but my KiCad v8 is two
> versions behind. (Perhaps they only update it on major updates, so that
> would be yearly.)
>
> Ben
>
>
> On 29 Dec 2024, at 17:34, Steve via Synth-diy <synth-diy at synth-diy.org>
> wrote:
>
>
> Ah, how does the one in KiCAD compare to good ol' LTspice?
>
>
> On 28.12.2024 18:59, Ben Stuyts wrote:
>
> For one thing it’s windows-only, so no, I can’t use it. Still use the
> somewhat outdated Mac version of LTspice. I now tend to use KiCAD’s built
> in ngspice every now and then, as it’s already in KiCAD. (
> https://www.kicad.org/discover/spice/)
>
> Ben
>
>
> On 28 Dec 2024, at 18:39, Steve via Synth-diy <synth-diy at synth-diy.org>
> <synth-diy at synth-diy.org> wrote:
>
> Hey list,
>
> the guy who originally made LTspice, IIRC, some time ago started a
> supposedly improved, in several regards, simulator named Qspice. Working
> for a different company, I heard rumors stock models are hence not by LT
> but the other vendor... perhaps not super important to everyone.
> Supposedly, you can code simulated elaborate functionality in C++ and
> Verilog.
>
> Here's something about what's different, and an article geared towards
> LTspice users.
>
> If anyone on here is familiar with both to feel like commenting anything
> the articles don't mentionm, please do.
>
> https://hackaday.com/2023/08/25/qspice-picks-up-where-ltspice-left-us/
>
>
> Introduction to QSPICE for LTspice Users, Part 1
>
> https://www.allaboutcircuits.com/technical-articles/introduction-to-qspice-for-ltspice-users-part-1
>
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