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# inductor

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Hello all, me again
I wish to know what is the formula to calculate the length and the diameter of an aircore inductor when you have only the inductance value. i.e. for example how to calcultate the diameter and length and turns of an inductor of inductance .15uH

thanks very much

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Try this: http://www.sweetscape.com/hamic/

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wow good software - thanks

but please can you tell me the mathematical formula to calculate all inductance etcc....

thanks

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• 2 weeks later...

if ur inductor is solenoidal..
inductance - L
Number of turns - N
Mo = (4*pi / 10000000)  ;  pi= 22/7
ength of the inductor = x
Area of circular cross section = A

formulae

L  =  ( Mo*N*N*A ) / x

* - multiplication

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if u want inductance for inductor with some other core ( other than air)

Relative permiability must be found

it is no more "Mo"(air core)
it ll be  "Mr"(relative permiablity)

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