[Solved]Book example and Kicad/Ngspice simulation results not the same

Schematic Simulation (Ngspice)
#1

Hello!
What am I doing wrong?

Book example 6.2.2:
https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/Book%3A_AC_Electrical_Circuit_Analysis%3A_A_Practical_Approach_(Fiore)/06%3A_Nodal_and_Mesh_Analysis/6.2%3A_Nodal_Analysis

.title KiCad schematic
R3 Net-C1-Pad2 0 400
R2 Net-C1-Pad1 0 250
C1 Net-C1-Pad1 Net-C1-Pad2 500n
V1 Net-R1-Pad2 0 sin(0 20 2k)
R1 Net-L1-Pad1 Net-R1-Pad2 100
L1 Net-L1-Pad1 Net-C1-Pad1 31.83mH
I1 Net-C1-Pad2 0 sin(0 0.1 2k)
…
.tran 10u 1.001 1
.end

example
example639×1530 159 KB

Edit: As I finished the question I noticed the L value is not correct, but still not close to the book result.
Too many places to put the values, do not know which matters for simulation.

#2

Try changing the Polarity of I1.

1 Like
#3

That worked. Thank you!

Is there an explanation?
Is there any connection with the ERC error: Input power pin not driven by any output power pins at VSOURCE?
How can I know what is the correct result if I have to flip a current source like that?
Sorry for the extra questions.

#4

The source symbols from PSPICE library are ugly.

I prefer the symbols from Simulation_Spice library.

No, ERC is not connected directly to simulation. But see Power Pin ERC Errors KiCAD 6 or search for the error message in the forum.

Check it out once (by simulation and reading the output) and memorize the result

2 Likes
#5

Great answers, thank you.