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Question:

How do I build an iron core inductor to specs?

I am wanting to build an inductor to certain specs.The inductor will operate in the audo frequencies of about 5-20kHz and be wound on an iron core. I need an inductance of about 150mH.How do I determine what type of core I need, what wire size, and the number or turns of wire will be required to make the inductor?Any help or references will be appreciated!

Answer:

L u0 ur N^2 A/length Where L is the Inductance and u0 4pi x 10^-7 and ur is the relative permeability of the core material (which should stay constant with current fluctuations) and N is the number of turns and A is the cross sectional area of the core and l is the magnetic path length. . all in SI units. The wire size will depend of how much current the winding has to tolerate without getting too warm. DON'T DO IT! There are so many factors that you'll wish you had never tried. Buy the inductor you need from an electronics shop and make sure its power rating can cope. Don't use an iron core - it will not be able to cope with the higher audio frequencies. A powdered-iron toroid might be best

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