Inductors made for crossover in an amp? - Page 2 - diyAudio
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Old 15th September 2004, 04:16 PM   #11
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My Coil Design and Construction Manual, by Babani Electronics Books, shows no equations, but tables for different contructions. Basically, you select an inductance from a list of common values, or from a nomograph to find other decimal values, then apply corrections to apply this data to a core of your choice (the ratios of data in the first table assumes one particular core). The assumption is made that you use a wire suitable for the current capacity, and the tables find a turns number which just happens to fill out the core. There are also tables for proper air gap, which the data assumes you use.

But that doesn't help you any, so I'll add: L = 3.2 * N^2 * mu * A * 10^-8 / l, where L is in henries, N is turns, mu is permeability, A is cross-sectional area of the core (center leg) in square inches and l is length of the magnetic path in inches. For generic transformer iron, mu = 1000 or so (up to 100,000 for mu metal).

RDH4 has a lot of info on the subject.

Tim
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Old 16th September 2004, 02:25 AM   #12
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Tim,

I have checked local bookstores but no book like that here.

Thanks for the equation btw. I am so interested in choke making that if you have additional data about them please send me a copy at jojod818@yahoo.com

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Old 16th September 2004, 11:28 AM   #13
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Default info fo PSU chokes

[QUOTE]Originally posted by JojoD818
[B]Just curious, why can't I find any details on winding a diy choke? I mean, we have the magnet wires, the E-I cores, covers and legs, the only thing missing is the number of turns and what size to use.

Jojo,
Radiotron Designer's Handbook is an excellent source for info regarding chokes and PSU.I wind my chokes using Hanna's method which is well described,and is in a way, empirical method,mostly.Just convert the values in metric numbers(if you need) and use the little graph for determing the gap,turns,etc....Haven't had any problems so far!

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Yugovitz
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Old 16th September 2004, 04:01 PM   #14
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Thanks!

Now I have to look for that handbook.
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