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Old 27th July 2012, 08:29 AM   #1
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Default inductor placement clarification

Hello chaps.

Could anyone tell me if the image below looks ok regarding the placement of inductors please in my crossovers? I know this has been covered before but in this case I am mixing an Iron core and air core inductors which may be different.

L1 is an TX iron core (Autoformer)
L2 is air cored
L3 is air cored

Many thanks

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Old 27th July 2012, 09:04 AM   #2
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in order for anyone to help, physical dimensions are helpful.
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Old 27th July 2012, 09:36 AM   #3
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Originally Posted by mondogenerator View Post
in order for anyone to help, physical dimensions are helpful.
Hi, cheers... OK, I've not got the dimensions of the air cores as yet but will get them soon. As a rule of thumb am I on the right track? It's the TX core one that is throwing me.
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Old 27th July 2012, 11:34 AM   #4
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L1 and L3 are both close together and in-line. They are very likely to cross talk. The rule of thumb is to put inductors at 90 degrees to each other. How about aligning one of those two up/down relative to the board? (vertical relative to the plane of the board)

David
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Old 27th July 2012, 12:19 PM   #5
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Cheers David. I can rotate L3 by 90 degrees. L1 is a little difficult to move now. Would this be ok?
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Old 27th July 2012, 12:25 PM   #6
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Along the lines of what David said, here is how I did it with mine.

The trick that I read was to make sure if you look through the centre of any inductor you can't see another one Also distance helps ideally 20cm between two similarly aligned coils (I don't quite get there).

Tony.
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Old 27th July 2012, 12:26 PM   #7
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Someone pointed this out to me once and I found it extremely helpful.

Placement of coils in crossover networks
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Old 27th July 2012, 01:08 PM   #8
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Wintermute shows a good example. He has coils in three different orientations (x,y and z) and the only two with the same orientation are at opposite ends of the board.

In your case mounting L3 on its end, rather than side, would be good.

David
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Old 27th July 2012, 01:15 PM   #9
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Chaps... thank you very much for your help.

I'll try L3 on it's end.

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Old 27th July 2012, 10:45 PM   #10
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Space is an inductor's friend. Far apart is better than close together.
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