How to Design a Coil for Specific Inductance

How to design a coil for a specific inductance that you need, including how to calculate the inductance and where to find an online inductance calculator. This goes through all the parameters: number of turns, area, length and relative permeability as well as mentioning some other factors like capacitance, frequency and coupling.
The webpage with the inductance calculator is here:
rimstar.org/science_electronic...
This video was made possible in part by these Patreon supporters:
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James Padden
Juliusz Wojtyga
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See also:
How to Make Capacitors - Low Voltage Homemade/DIY Capacitors
• How to Make Capacitors...
How to Make Tesla Coil - Small Spark Gap Tesla Coil
• How to Make Tesla Coil...
How to Make/Build a Crystal Radio
• How to Make/Build a Cr...
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[@learnerlearns]

Superb presentation Sir! If school was like this, the world would be a smarter place.

[@h.sapienstechnologicus8865]

I’ve seen ALL of KZbin’s inductor videos and this IS THE BEST of them all. For me. I understood everything you said. Solid content.

[@cr8cat794]

This is quality, crystal-clear explanation. This makes it clear how to experiment and how to achieve a desired goal. Thank you!

[@aborgeshonorato]

I love you 💓 and your channel. I am teaching Physics in India for the first time and your channel is a huge resource!! I can't believe that you are providing it for free. Thank you and God bless 🙏

[@hughh106]

Great Video, your crystal radio series has got me building them.

[@stevedoubleu99B]

Excellent tutorial Sir. As inductors have never been my strong subject, my brain was overheating a little, but i'm gonna stick with it!! Thank you.

[@MarinusMakesStuff]

Thanks, I've been working on Mendocino motors and coils for charging (induction) and signaling (with a hall sensor or a reed relay) a bike light design. This comes in handy!

[@itaylavi2556]

the best explanation about inductors design ive ever seen

[@loveboyhatch]

Keep doing what you do! You are helping big time! Thank you :)

[@keghnfeem4154]

That is great. I need to make a delay line with inductors and this info will really help.

[@thepricklyseed]

Thank you very much for making this video and the online calculator.

[@diecksl]

Thanks! I was looking for a guide like this for weeks!

[@sidocious]

Thank you for this tutorial, it is really excellent and a really simple way to understand how it works. Better than some tutorial in my own language :)

[@DeandreSteven]

Thank you so much for this. i was mullung over this while trying to build a primitve smps.

[@Taran72]

this is one of the best videos on inductor's I've seen so far. Straigh tto the point, practical, and easy to understand. thank you for sharing! :)

[@WTF_BBQ]

I love the way you explain it. Makes it simple to understand. The first time I glanced at the formula, it was very intimidating until you broke it down.

[@RimstarOrg]

Cool. That's exactly what my goal was so I'm glad to hear my explanation worked. Hopefully you'll be a little less intimidated by formulas in the future since that'll open up whole new worlds.

[@shaunsanders9673]

Fantastic tutorial - much appreciated! Thanks.

[@bharatkukreti8449]

What an interesting way to simply the inductance making...luv it

[@z11542]

OMG. You must be a teacher. If not then you would make a great one. I always learn a lot from your videos. You are the best i have come across so far on the internet. And the internet is quite large.

[@gazzabro55]

This is exactly what I was looking for, thank you.

[@MongrelShark]

Great Video. I wish there was a guide like this when I was a kid :) No doubt I will be linking to this one a lot :) I especially like the mentioning of all the Formulas, including the thumb rules and rounding off's that regularly get used when designing coils. Those little details can get a lot of people stuck on the theory unnecessarily. When they would learn more by just forging ahead and giving it a go so they can see how it works.

[@RimstarOrg]

Thanks. Yeah, formulas are great guides. They're a lot of knowledge compressed into a small area. There's still a lot they don't say, but they go a long way.

[@MongrelShark]

Formulas are easy to google. Its not always so easy to get a quick yet accurate guide to using them. Its very helpful to show how they work and which numbers are constants and which ones can be rounded etc to make it all more user friendly while maintaining an acceptable error margin :) For beginners looking up LC circuits it can be very overwhelming. Now thanks to this video it needn't be :D

[@RimstarOrg]

Do you mean the thickness of the wire? The only effect the thickness of the wire will have is that thicker wire will mean a longer coil and length is a variable in the equation (see the inductance formula in the video). If you're trying to keep the coil a certain length then a thicker wire will mean that you can fit fewer turns into the same length. If by thickness of the coil you mean the wire thickness' affect on the coil's diameter, then the diameter includes the thickness of the wire. That's because the diameter is measured from the center of the wire on one side to the center of the wire on the other side. The diameter goes into calculating the area variable in the formula.PS. Sorry for the delayed reply. For some unknown reason, KZbin flagged your comment as spam and then didn't tell me about it until now.

[@btcminer6496]

@@RimstarOrg I googled lots of times to find a formula to calculate the inductence but each websites shows different different formulas .Which one is the correct ?Please reply me too.Here are some examples 👉L=MaN^2A/d 👉L=D^2n^2/45D+100l 👉and your formula.

[@ivarnordlkken8082]

Theese formulas were in my electronics textbooks already 50 years ago. Before KZbin.

[@KJFMZ]

The video I didn't know I've been looking for for a year. 👌

[@shiva.chennai]

Excellent video content. It is worthy to see the video.

[@sydieonshaw2707]

THANKS!!!! I was looking for this for a long time... I’m building my own we n low-pass crossover

[@SuburbanDon]

Great job. Clear and direct. Thanks.

[@R462venom]

Thanks! I couldn't find the answer to why Tesla coils use air cores until your video mentioning it! Thankyou!

[@jamesallen6007]

Superb explanation. Many thanks to you.

[@electronicsNmore]

Great video! I've used a few good online inductance calculators over the years. Having a good DMM with an inductance range makes life very easy. :-)

[@yehiaelrifai2545]

Very informative and precise to the subject matter

[@yurigagarin4974]

I found your calculator online before finding this vid, Its very helpful thanks!!! 👍😎🇬🇧

[@RimstarOrg]

Glad to hear it helped! Thanks!

[@jonathanhess9726]

Man you made this too late for me because I learned this over the summer.... Man you explained it so much simpler. Thanks :D

[@rambo8863]

Nice this help to find out more about coils, and i might eventualy learn to make my own circuts after my desiger

[@fabianarango7596]

This man is what i call A GENIUS !!

[@acestudioscouk-Ace-G0ACE]

That helped my learning curve, thanks!

[@Purplerabbitstudios5139]

Thanks a lot for the calculator. IT really helps.

[@hadireg]

Nice! Thanks for this knowledge sharing!

[@annelieseocallaghan801]

You are absolutely wonderful! Thank you very much.

[@crispijnvansas]

Thanks for the video, I’m currently working on a coil for a bike light and want to calculate the amount of watt being output from a coil. How would that relate to the inductance?

[@jameselliott9397]

Completely 100% awesome video. Thank you so much.

[@richardjermain4052]

Thanks so much. A lot of my projects will be much easier :)

[@josephbaca344]

Good work sir. Thank you.

[@kaustubhponkshe6186]

Great Video . I request you to make video on tuned transistor amplifier design. It should include , design of biosing resisters , tank circuit etc

[@theroguetomato5362]

Really informative, thanks so much!

[@leskuelbs9558]

great video. lots of neat info.

[@davoodseify3624]

thanks, nice and informative information. very useful

[@mariuspaskevicius9204]

Super, very imformative ! 🔥

[@thevintageaudiolife]

Hello! that's a wonderful receiver! thank you for sharing.

[@dinnade9338]

This is really helpful ... thank you

[@leonardochile8735]

Thanks for posting.

[@ddanilov22]

Thanks for presentation!! That's an awesome lesson!

[@RimstarOrg]

Thanks Dan! I'm glad you liked it. Thanks for watching all these years.

[@ihsanbu]

thanks for these nice information about coil

[@pdanayal]

Excellent explanations too good and very nice vlog . from India take a like.

[@markjulius2006]

Wow. Finally someone who knows what the hell he's talking about. I've asked so many people about everything in this video, and almost no one could tell me the science behind making a coil. Nice job.

[@ed9709]

Very clear Sir. Thank you.

[@javackman7]

very good video helped me learn this beter. thank you

[@axnbjsbdudbydvydubu9355]

Hello RimStar, can you please do calculations video for an induction AC motor ? thank you

[@BarefootBeekeeper]

Really useful, thanks!

[@pabloosvaldopenizzotto1098]

How you can apply this formula for a multi layer coil? Let’s say for a crossover network in a speaker system. Do I have to use the same formula for each layer with the small diameter variation, then considering all coils in parallel?

[@RimstarOrg]

For multilayer you need different formulas. Try googling "coil inductance formula multilayer".

[@gerardmelvin8670]

Very Good Video my friend thanks .

[@red_juan]

I have a question, what would the formula be if it was a square coil? Like in stator of electric motors, or is that reduced to a circular coil for simplification?

[@keeperofthegood]

Does shape affect how an inductor behaves? Not in terms of measured or calculated inductance but in how that inductor responds to changing frequency or loading or in transmitting? For example, if I had two 240uH inductors, one on a round tube, and one on an egg shaped oval tube (say I taped a sharpie to the cardboard tube then wound the coil so I had a nice prominence for my wiper) would there be a difference in how they behaved?

[@catman4471]

Question: My circuit consists of a 1 to 30hz oscillator where the output is amplified to drive a 14.3uh flat coil but I wish to substitue the flat coil for a Helmhultz pair with a distance between them of 10 to 12 inches and coil height from between 2 to 12 inches or ideally two separate coils of 2 and 12. What are the calculations for that? ps: The current flat coil design the magnetic field strength is about 3 Gauss for 5% duty cycle and about 34 Gauss for 95% duty cycle.

[@martinlicht1969]

Thanks for the helpful information; how does wire guage/ coil resistance play into this? Appreciate you sharing some great basics

[@pilerprism8468]

The thinner the wire the less current can flow through

[@TSulemanW]

Nicely explaination

[@user-by3wu3uw3y]

Great video thanks a lot

[@TheArtofEngineering]

Question.....Also Merry x-mas!.....I just built a double balanced mixer.....I bought some toroid cores from Jaycar. Turns out they are "iron cores" usually used for EMI suppression. My question is.....does the type of core become more critical when frequency increases? I think my DBM is actually an RF attenuator! When I fed my nano-VNA directly into the antenna socket of the DC 3.5Mhz rcvr I built using this DBM I could hear the sweep tone it was generating in the 80m band....I have ordered the correct toroids...hopefully this will fix it! Are air cores usually ok for HF (below 30mHz) if I don't have a toroid? Thanks for the great content!

[@natasho4835]

What kind of coil do I need to use when I have a esaki oscillator hooked up to a DC to DC boost converter ???

[@realkh7974]

Good tutorial

[@jilljulaton9936]

You're a great man god bless

[@user-sg9nu7ym7z]

full explanation thank u

[@bigsofty1977]

How many turns on a coil for perpetual pendulum? Does it matter which side of the coil uses positive and negative? I’m using 3volts to power the coil.. does that effect the number of turns I’ll need?

[@scottfoulk7480]

Excellent!

[@moinshaikh6684]

Mond blowing honest explaination...!!!

[@hili467]

:O Omg please please please do one for the capacitance of coils too!

[@techtinkerin]

Thanks really helpful 👍❤️😎

[@jnc5255]

Thank u very helpful 😊

[@electronicelectrical9125]

Hello sir, I hav one question about tunning inductance... Sir suppose i am going to generate some magnetic field so that their need one tunning inductance and magnetic field inductor. ........... My que..... how to calculate or relation between the tunning indutanc and their magnetic field inductor ....

[@007jacquie]

★ Awesome Report Thank-you ★

[@munivel9653]

Sir I want to design a low pass filter for a frequency 100hz,, how to calculate and design a inductance... please give me one example sir

[@jainishshah2951]

i want to make 22nh inductor so how i would calculate the area and length for it??

[@zaccomusic]

nice content I hope you keep update :)

[@arvindh13]

great video.

[@EnergySeeker]

am designing a generator and i need to know for my coils how many turns of AWG 17 and how much voltage it will generate with 1000 RPM with magnet N52 1" x 1" x 0.5 " how please help

[@areyouavinalaff]

I have some speakers I need to repair but I'm not sure what gauge/thickness of wire to buy for the voice coils. data I have found: Kapton with 1.005″ inside diameter, 1.125″ form length, 0.437″ windings width, 8 ohms. so what gauge or cross section wire would that be?

[@areyouavinalaff]

data provided is based on replacement coils I can buy but I don't want to buy lol

[@elnursadykhov9812]

Is there any formula for calculating the inductance of one-turn saddle-shaped coil?

[@richardphatthenguyen195]

Hi, when you said for low frequency application suitable for iron based core. Is there any thumbs of rules that define those region? Like Khz, Ghz, Mhz,etc? I am newly introduced to in inductive charging, and I have to make an antenna coil with steel core due to requirement. Basically trying to use those QI transmitter to power a device with steel core.

[@RimstarOrg]

There are ferrite materials which are more suitable for higher frequency but you have to look up the specific ferrite material to match your frequency range. I don't have any experience with GHz. Whether or not a core is suitable also depends on your application. As I said near the end of the video, Tesla coils don't want a core whereas step-up and step-down transformers benefit from one. In terms of power transmission, I've only played a little with it but from what I see, they tend to not have a core, though possibly a core on one side only.

[@johnmartin6178]

Good video. Only just found this on YT so wonder if you have done a vid on making toroid coils, or the calcs thereof?

[@RimstarOrg]

No, sorry, I haven't.

[@emmanuelbabu2215]

Just wanted to know...are ferrites available in blocks or slabs for buying ....online?

[@farabielec]

Thank you

[@jerichotm2122]

Thank you! That was very inspiring! :) Though... I need to do a specific coil with multiple leyers and on Iron-Silicon sheets ... its for audio crossover, and since this coil that i'm trying to build needs to cross a speaker at about 175 Hz, I definately need Iron core, because by my calculations it has to be around 6.2 mH... its huge if I have to build it on air core! But I do not know what is the permeability of this type of alloy (iron-silicon)... on wikipedia it says its around 19-90! I don't know what to do anymore... my sheets have 15 mm width/ 71 mm in lenght and I have used 30 of them because they are only 0.3 mm thick

[@vincentpereira8416]

Very nice

[@adnacraigo6590]

Well you blew my mind.

[@erwy-sf5ze]

Thanks You re the best

[@wingedbull1257]

@RimstarOrg I have two N52 Magnets Size 2"L x 1"W x 3/8"H and Magnet wire 18Awg, I will have One Magnet face North and other South But I need to make One Magnet wire Coil that both Magnets rotating 360 degrees in center of One Coil to produce at least 14 Volt and light up 150 watts light bulb, How many turns of magnet wire I need to do or have to produce what i'm looking for the out put. I look forward to your reply

[@pardeepmanro7471]

Great words by you. Can I request for induction calculation

[@pedroasg9384]

Hello ! I enjoyed yor video very much , it teached me a lot but i have one question : What material would you use to build a wind turbine generator ? Congratulations for Your Great Work

[@RimstarOrg]

I don't know, I've never built a wind turbine generator. I'd imagine you would not use an air core though. Likely ferrite or layers of steel insulated from each other to minimize eddy currents. I'd suggest searching on KZbin for DIY wind turbine generators -- I know I've seen them around, though I don't recall any details.And thanks.

[@crancowan8020]

I like it better when folks use units in physical equations. For example, the 'mysterious' constant 1.26ee-6 is really just the magnetic permeability of free space in units of H/m. As such the distances should also be in meters.

[@home_Grown_studio]

I would like to build a Crystal radio with the use of coils. I am a big fan of Konstantin Raudive and the circuits he has created. I would like the ability to cover frequencies below the AM band. How is this calculated ? Is it possible ?

[@RimstarOrg]

I don't know how low you can go but I imagine you can go below AM frequencies. I talk about the calculations in this video here kzbin.info/www/bejne/qpunanxvard0mNk about LC circuits. My webpage with the calculators is here rimstar.org/science_electronics_projects/lc_circuit_aka_tank_or_resonant_circuit.htm

[@sagarkayasth8376]

How can i make the E-core inductor?

[@arnikumbh1]

Dear Sir as suggested by you for 6 X6 inch aluminium paper diameter works out to be two inch,. Can I try with one inch dia card board cylinder, increasing its length so that aluminium foil area will be 36 sq. . inch. My quiry is do I have wound aluminium foile butting there edges.

[@RimstarOrg]

Yes, you can increase the length to get the same effect. The important thing would be to have the same area.