Air core inductors, calculations
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 25th July 2004, 06:01 PM #1 r!sc!   Account Disabled   Join Date: Jun 2003 Location: Serbia Air core inductors, calculations Hi, I need for the x-over next air core inductors: 1mH - 14ga wire 1.5mH - 14ga wire 0.25mH - 20ga wire I found on http://www.lalena.com/audio/calculator/inductor/ air core calculator but i don't know what is the best proportion-ratio between Coil Diameter and Coil Length. Please, can someone help me with this calculations? Just one hint, the inductor (finished) should be not to big in diameter. Thanks, Boban
 25th July 2004, 08:48 PM #2 r!sc!   Account Disabled   Join Date: Jun 2003 Location: Serbia Nobody
 25th July 2004, 09:22 PM #3 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN http://home.earthlink.net/~jimlux/hv/wheeler.htm I am not sure where the lalena formula came from, although it appears to be a modified version of wheelers single layer formula. With the test coils I have made, the wheeler formulas are satisfactory. Shape does not appear to be a really sensitive factor for coils. I minimized the wheeler equation for lowest DCR and found one minima at 6*a = 9*b = 10*c , if I am recalling things correctly. Rather large deviations from this shape (that had the same inductance) did not appear to change DCR much... Some other equations specify that the inner radius of the windings should be equal to the length of the coil, ("b" in the equations below) The equations below are copied from the page in the link above, but they can also be found in the ARRL handbook and many other places.. ---------------------------------------------------------------- L (uH) = 0.8 * a^2 * n^2 / (6*a + 9*b + 10*c ) where a = average radius of windings b = length of the coil c = difference between the outer and inner radii of the coil. all dimensions in inches. It states that it is accurate to 1% when the terms in the denominator are about equal. This is also an equation by Wheeler. It applies as long as the coil has a rectangular cross section. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 25th July 2004, 09:37 PM #4 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN http://www.fnrf.science.cmu.ac.th/th...ed%20coil.html Note that the link confirms the low sensitivity of shape, but gives you the answer you wanted. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 26th July 2004, 10:44 AM #5 Jay   Banned   Join Date: Feb 2003 Location: Jakarta Or you can go to http:\\www.solen.ca and check their inductors' size and dimension before plugging the numbers into the online calculator. Their dimension is computer optimized.
 26th July 2004, 11:30 AM #6 r!sc!   Account Disabled   Join Date: Jun 2003 Location: Serbia Great . Thanks. Boban
 26th July 2004, 03:10 PM #7 rabbitz   diyAudio Member     Join Date: Jul 2003 Location: Newcastle, Australia Here's a great little calculator. http://members.optusnet.com.au/~audiosoft/inductor.exe

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