Totally noob in kicad. I’m trying to make pcbs for hifi passive filters, and am not able to make my own components in a custom library. In fact, i can make the well sized print of the inductance for example (2 diameters, in, out), and on the other side i’m able to make the symbol… BUT can’t link the two together…
When i do the scheme, when i want to go to the PCB, a message say’s the symbol does not have any footprint…
I have 5 little PCBs to make… very simple… but i already find hard to make only one custom component…
Can someone guide me step by step to make one PCB from scratch to the Gerber file ?
To be fair, before you start custom anything there are more than enough components in the standard libraries to make hifi simple filters. Do you mean symbols for your schematic or footprints for your PCB ? What I suggest is following a workflow from start to finnish from either the Kicad Docs or try our very own ‘Getting to blinky’ tutorial, also there are a lot of good youtube vids to try. Take it easy at first, play about and it will all fall into place I assure you And welcome to the forum ! and don’t hesitate to ask !
Are you starting from a schematic layout of your circuit ? you should be! and none of those numbers or names mean anything at this point, an inductor is an inductor and has a symbol and a resistor is a resistor and also has a symbol. The manufacturer and the value are essentially meaningless at his point you add them later. A component is a physical object and its dimensions are added in the form of a footprint. A component is represented by a symbol in your schematic which you choose from symbol libraries. As I said earlier you need to watch a video of someone’s workflow or follow steps in the Documents that come with Kicad.
It’s difficult to get you going because you need to understand some terminology as well.
Jantzen inductors is something you add for your own convenience, or somewhere you go for a ‘symbol’ or a ‘footprint’ it’s not something Kicad needs to Know. I don’t know if this will help, but without studying EDA CAD at a very basic level its gonna be a long haul
Your inductors, resistors and other symbols can be found in the ‘Device’ library. From the schematic point of view it doesn’t matter if the resistor is an 0402 chip or a chunky wire wound power resistor. You will need to check footprints but I would be surprised if the components you have don’t fit an industry standard footprint but, even if they don’t, it should be easy to modify something similar.
KiCad is not Eagle - symbols and footprints are separate entities.
I would really encourage running through a recent tutorial and actually build a blinky or similar project alongside the tutorial. You will probably find it all becomes a lot easier when you then lay out your own circuit. Don’t try to cut corners and please, make a schematic first. So many people try to fight against the normal workflow and get frustrated.
I started with the custom inductor aand started to understand it would be difficult. I see now. But what about the inductor ?
When you have to go to the footprint ? How to transfer from the electrical scheme to the footprint ? As i can’t link them…
So once you have the schematic, you associate the footprint for your inductor (and the other components) with the appropriate footprint. I just had a quick check - the default KiCad libraries include footprints for over 900 different sized inductors - perhaps one of these might be what you need.
BTW that top circuit of yours. I hope that’s a high frequency tweeter. Calculation shows that the frequency would have to be around 10 kHz for that capacitor of 2.7 µF to have a reactance of about 6 Ω. I probably can’t hear that now; I’d have to get a dog to detect that frequency.
First, you place the Inductor symbol from the Device Library on your schematic, as shown by @John_Pateman
Next, with your RIGHT mouse button, click on that symbol. The seventh line down in the newly opened window reads “Properties”. Left mouse button click on that (or hover mouse over the symbol and press E for the shortcut to Properties).
Now you need to fill in some of the details in the “Value” column for the inductor so a footprint will show on the PCB.
The Reference is the part number assigned by Kicad that appears over the symbol in the schematic AS WELL AS the footprint in the PCB. You can leave that alone.
The Value (in your case you mention above) is 3mH. Fill that in.
The Data Sheet: click on the value and at the RH end is a globe. Click on that and the www opens. Surf the www to find the data sheet for the exact inductor you wish to use for your project, then place the link in this value position (this value is not strictly required to link a footprint to a symbol).
The Footprint: using the data sheet you have found, or measuring the inductor you already have, click on the books at the RH end of this value line. This opens the Kicad footprints libraries. Select a suitable footprint for this inductor and place that footprint link in this value position.
By completing the top three values (Ref, Value & Footprint) you now have a Kicad symbol in the Schematic linked to a Kicad footprint in the PCB.
This procedure needs to be done for each symbol you place on the schematic.
This whole procedure is described in the “Beginners Guide” mentioned above.
Tell us the spec (or part number) for the component that you can’t find a standard footprint for . . . then using that example we can tell you what you can do to either:
And welcome to the forum ! and don’t hesitate to ask ! 
