How to Calculate and wind Toroid Core inductors

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This video shows how to calculate toroid core inductors using the AL value from the datasheet. This video is taken from my Wilkinson Splitter / Divider Design video and has been isolated as dedicated video.
The website toroids.info/ offers AL values for various, common toroid cores and includes an on-site calculator.
Toroid core inductors are very commonly used around the amateur radio community. For fancier winding techniques, check out Alan's channel (W2AEW). He has great content around all kinds of electronics related topics.

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18 апр 2022

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Комментарии : 17

@JohnTarbox 2 года назад

Excellent tutorial!

@dalenassar9152 2 года назад

You really need to use the INNER circumference of the toriod to calculate the # of turns that will fit, since this is the limiting factor for the max. number of turns that can fit...you will have gaps between wire turns on the outer surface when the inner circumference is tightly filled. Thanks for the great video...I am especially interested on the Al factor. Can you maybe do a video mainly explaining Al and using it??

@josepeixoto3384 Год назад

bad start for me Al ,4 , 50 what are those?

@dalenassar9152 2 месяца назад

I am still a bit confused about this calculation. If AL is given in micro henires (uH), and AL=4uH, Then only ONE turn would give an inductancd L=4uH...which is 4000nH...already 10 times higher than what you need (400nH). THANKS for making me think. BTW: I have found that just touching the leads of an inductance meter through (or inside) the toriod, gives a direct reading of AL.

@BalticLab 2 месяца назад

The AL value is given by Amidon in µH per 1000 windings. The inductance L is thus calculated by: L = (AL × N^2)/1000 where N is the number of windings.

@huss03 9 месяцев назад

I'm looking at manufacturer's data for a specific toroid and the AL figure given appears to be within the range of 89 - 210. How does one possibility design around that kind of variance?

@BalticLab 9 месяцев назад

If no dependent variable is given for the range, I'd use the geometric mean for design, so sqrt(89×210) = 136.71 nH

@huss03 9 месяцев назад

@@BalticLab Thank you very much. For reference, the part number is Proterial FT-3KM 4627H. Thanks again!

@jboy4real Год назад

Please how did you come about the value of the inductor to be 100uH before design

@BalticLab 5 месяцев назад

That is shown in my videos on Wilkinson Power Splitters

@ndidikenneth5135 Год назад

I have seen some numerous examples of inductor winding with superfluous maths can't inductor winding be explained without these hassles? I still don't get it

@BalticLab 10 месяцев назад

No, because then it would be a 30 second video at max as anyone should be capable of wrapping some wire around some core material without guidance. To know how much wire you put on there, that is kind of the part that needs figuring out.

@mohammadalfauomey3443 2 года назад

I can't see well what you wrote . You must magnify the picture . Thanks

@isaaclomas1304 Год назад

where do you find the value of AL?

@BalticLab 10 месяцев назад

In the Datasheet.

@dalenassar9152 2 месяца назад

Have you actually measured the inductance of your toriod-wound 10 turn coil??...maybe not. I have tested this using L=AL*(N^2) with several different coils, and this formula worked every time. 400nH is quite small for winding on a toriod (whenever I need < 10uH, I have always used air-core). The first thing that comes to mind when I see a required 400nH (0.4uH), is 'air core'. If you measure the L of your coil, I think you will get about 400uH...not 400nH...that's 1000 times higher. THANKS, --daLe

@BalticLab 2 месяца назад

Your statement is still incorrect. Please note that different manufacturers give their AL values in different "units". L=AL*N2, L=(AL*N^2)/1000, L=(AL*N^2)/1000^2 and L=(AL*N^2)/100^2 are all acceptable equations for toroid inductance depending on the manufacturer's specifications. While I didn't specifically measure the inductor, I did use it in a practical, reactance dependent circuit. And the performance was spot on (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3IAVJ4gVunE.html). Additionally, online calculators would confirm my math for the Amidon cores: toroids.info/T50-6.php