How to create an inductor
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ViktoriaHill 4 weeks ago
The inductor we are using is a .13 uH, but there is no inductor that small in the libraries, so I need to make one. How do I do that? I've watched some videos on adding custom parts, but I'm still not sure how to do it for an inductor.
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ViktoriaHill 4 weeks ago
Also, it looks like the mono audio jack I need to add isn't here either, so if someone knows how to add one of those, that would be helpful.
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JLCPCBsupport 4 weeks ago
@ViktoriaHill Hello ; Thank you for posting here your question :) you wrote above "_The inductor we are using is a .13 uH, but there is no inductor that small in the libraries_". Small you mean small in size or in inductance value? If you mean inductance value then let me tell you that during schematic designing; values of parts are not as much important as the parts footprints. Values are important when you want to simulate your circuit behavior, but if you just make a schematic to transform it into a PCB design then you can select any available part that has the same package (footprint dimensions) as your real inductance. You can check the datasheet of the inductance that you have to define the package that you need. Also you can create a new schematic Lib related to you part and create a new PCB Lib related to your part footprint and associate them to create the new component that you need. Please find more in this link : [https://docs.easyeda.com/en/SchematicLib/SchLib-Create/index.html](https://docs.easyeda.com/en/SchematicLib/SchLib-Create/index.html) Maybe if you provide the part datasheet then we can help you solve this issue.
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andyfierman 4 weeks ago
Please see: [https://docs.google.com/document/d/1ZRkPPMID68mBz9j9RMIJARNSXK12PDULZXP7kiThvDg/edit?usp=sharing](https://docs.google.com/document/d/1ZRkPPMID68mBz9j9RMIJARNSXK12PDULZXP7kiThvDg/edit?usp=sharing) [https://docs.easyeda.com/en/SchematicLib/SchLib-Create/index.html](https://docs.easyeda.com/en/SchematicLib/SchLib-Create/index.html) [https://docs.easyeda.com/en/SchematicLib/SchLib-Subparts/index.html](https://docs.easyeda.com/en/SchematicLib/SchLib-Subparts/index.html) [https://docs.easyeda.com/en/SchematicLib/SchLib-Wizard/index.html](https://docs.easyeda.com/en/SchematicLib/SchLib-Wizard/index.html) [https://docs.easyeda.com/en/SchematicLib/SchLib-Attributes/index.html](https://docs.easyeda.com/en/SchematicLib/SchLib-Attributes/index.html) [https://docs.easyeda.com/en/PCBLib/PCBLib-Create/index.html](https://docs.easyeda.com/en/PCBLib/PCBLib-Create/index.html) [https://docs.easyeda.com/en/PCBLib/PCBLib-Edit/index.html](https://docs.easyeda.com/en/PCBLib/PCBLib-Edit/index.html) [https://docs.easyeda.com/en/PCBLib/PCB-3DLib-Import/index.html](https://docs.easyeda.com/en/PCBLib/PCB-3DLib-Import/index.html) [https://docs.easyeda.com/en/PCBLib/PCBLib-Naming-Rule/index.html](https://docs.easyeda.com/en/PCBLib/PCBLib-Naming-Rule/index.html)
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andyfierman 4 weeks ago
@JLCPCBsupport, @ViktoriaHill, "...during schematic designing; values of parts are not as much important as the parts footprints." I understand what you mean here but a little clarification might be helpful for some of our less experienced users. Most of the time, the value of a part in a circuit does matter and changing it without understanding the reason for the original value or the consequences of changing that value can be very risky. However, so that the design can be progressed and the PCB layout not held up it can be helpful to put something down in a schematic with the correct PCB Footprint assigned to it, even though a physical part has not yet been found from a supplier or a final value has not yet been fixed. Once a suitable part has been identified in the chosen package size then the value and supplier attributes can be edited in the schematic so that the BoM is correct when parts are ordered. So for example if you need a 130nH inductor in an 0603 package, just find any other value of the same type of 0603 inductor, place it in the schematic and then edit the value and supplier part number and any other relevant attributes once you have identified a suitable supplier and supplier part number for the desired 130nH inductor. * You must of course remember to: 1. update the relevant attributes in the symbol _before_ the parts order is placed from the BoM; 2. ensure that a suitable part in the specified footprint has been identified _before_ submitting the PCB for manufacture. Following the **Essential Checks** in (4) and (6) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a) will ensure this happens correctly.
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JLCPCBsupport 4 weeks ago
@andyfierman thank you for the details, what I pointed to is that during designing the schematic (which will be converted to PCB) it is not so important to write the parts value since this is not a physical implementation and this will not impact the design as long as it is just a design to create a PCB from it and nothing else, BUT as I mentioned already, during assembly or simulation (when it comes to real test) then values are important. Talking about PCB manufacturing, as we mentioned these in many posts before, producing pads for a 10 MOhm resistor that has a 0805 package is the same as producing a 1 Ohm resistor that has the same package 0805, so here values doesn't impact the circuit production. @ViktoriaHill The best solution for you is to learn how to create your own part following the links that Andy shared in the above comment because this is a one for all solution and this way you will not need to look the availability of parts footprints in the library and you will create your PCB with more confident that every single pad will fit properly.
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ViktoriaHill 3 weeks ago
Thanks for your answers. I'll take a look at those links. I definitely am an inexperienced user, so thank you for your help. So what we're working on is an FM transmitter project, and the inductor that we have we actually made out of coiling wire, so it doesn't have a data sheet. We just used a formula for number of turns and length and stuff.
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andyfierman 3 weeks ago
@ViktoriaHill, "...we actually made out of coiling wire..." In that case, a lot may depend on what the function of that coil may be in your circuit and how you have constructed it.
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andyfierman 3 weeks ago
If you are feeling adventurous, you could try making it as a PCB coil. You might be able to bully this tool into working at VHF.... [https://webench.ti.com/wb5/LDC/#/spirals](https://webench.ti.com/wb5/LDC/#/spirals) I'm sure there's other stuff online that can be used. :)
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JLCPCBsupport 2 weeks ago
@ViktoriaHill Hello; Please consider which material to select when you produce a RF circuit board, FR4 is not the best of choices. For some designs, dielectric PCB properties are critical whether it's high-speed designs, RF, microwave, or mobile applications - where power management is key, you're finding more situations that require dielectric PCB properties in your prototypes that standard FR-4 just can't deliver. FR-4 material provides the base standard for PCB substrates, delivering a widely effective balance between cost, maneuverability, electrical properties, durability and performance. But when electrical properties and performance are critical to your designs, Rogers delivers: * Lower Dielectric loss * Low signal loss Please search more about this topic if you find it relatively important to your project.
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andyfierman 2 weeks ago
FR4 is fine for up to about 1GHz. Actually it's fine for at least 2.4GHz as long as you characterise the material and stick to the same material supplier and board Fab. All the commercial mobile phones, Bluetooth and WiFi products are built on "standard" (i.e. dirt cheap) FR4. "...where power management is key..." That'll be for Microwave power amplifiers and switch mode supplies using GanFETs being switched in the GHz region. If it's an FM Transmitter then I would assume it is operating somewhere in the VHF band, say 80MHz to - 150MHz to include the 2m Amateur Band so absolutely no issue with FR4. Other high performance substrate supplier to consider alongside Rogers are Arlon, Isola, AGC-Nelco and Panasonic. This is just one of many good papers about PCB materials: [https://speedingedge.com/PDF-Files/Materials_RickH2.pdf](https://speedingedge.com/PDF-Files/Materials_RickH2.pdf) It's mainly concerned with High Spped Digital but the same effects apply for RF, just over a narrow band of frequencies. Rogers supply the very nice MWI-2020 tool (and their ring resonator tool is great for helping characterise the substrate material) for free: [https://rogerscorp.com/Tools](https://rogerscorp.com/Tools) and for other work a multi-layer dielectric field solver tool such as mdtlc: [http://mdtlc.sourceforge.net/](http://mdtlc.sourceforge.net/) and a Smith Chart Tool: [https://www.microwaves101.com/smith-chart/smith-chart-tool-v1](https://www.microwaves101.com/smith-chart/smith-chart-tool-v1) [https://www.will-kelsey.com/smith_chart/](https://www.will-kelsey.com/smith_chart/) and this free tool is priceless: [http://www.hp.woodshot.com/](http://www.hp.woodshot.com/) (IIRC, it runs OK on WINE.) :)
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ViktoriaHill 1 week ago
It is an FM transmitter. Is there a way to just take an inductor that already exists and just go in and change the inductance in the parameters?
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andyfierman 1 week ago
Just select the symbol and change the value (Name) in the right hand panel then press enter: ![image.png](//image.easyeda.com/pullimage/o6Z0KHCuOZraZhzEsIRz4RDc3Alm48NhBRVKEIKk.png) or double-left-click-on the value (Name): ![image.png](//image.easyeda.com/pullimage/BzWzT1ynty0SOqOx9fo3Y40aLyvBPOOAPV8ZeeeF.png) change it then press enter. * Note however that all other attributes will stay the same unless you change them in the right hand panel so you must check them:  * before ordering your parts from the BoM * **and** before converting the schematic to PCB. Please follow the checklists (4) and (6) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)
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