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Old 7th July 2012, 03:39 AM   #1
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Default Inductor Polarity??

Ok I know that sounds like a silly question, but is it?

Some high quality film caps are marked with an "In" and "Out" lead marked on which lead is connected to the inner or outer part of the cap.

and while I was looking as some foil inductors It dawned on me that maybe they have a "preferred" direction related to signal flow as well?? Would we want the "In" to enter from the inside of the inductor and exit out the outer part? or the reverse?

ZC <---over thinking things once again!
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Old 7th July 2012, 07:53 AM   #2
RJM1 is online now RJM1  United States
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No polarity.
For example, if you have a 60Hz signal across the inductor wouldn’t your input and output swap 60 times a second?

Last edited by RJM1; 7th July 2012 at 07:58 AM.
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Old 7th July 2012, 10:06 AM   #3
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A layer wound inductor might have different strays to ground from either terminal, so at RF there could be some asymmetry
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Old 7th July 2012, 12:24 PM   #4
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Sure, every inductor has a polarity. For audio, I doubt it carries any meaning other than the interaction between coils in proximity to one another. The fields can buck or boost with one another with the same excitation. Again with music content with its various phase shifts of sine waves, I doubt it is of any practical effect- just keep spacing and orientation per the recommendation of other threads.
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Old 7th July 2012, 05:41 PM   #5
DF96 is offline DF96  England
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Caps are marked so that the outer can be connected to the lower impedance end in order to minimise electrostatic pickup. In many cases it doesn't matter anyway. A similar effect might possibly happen with an inductor.

Inductors also have a real polarity as, for example, a solenoid can be right or left-handed. This changes the polarity of induced voltages from elsewhere, and the polarity of the external magnetic field. Swapping ends does not change this (think about it!).
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Old 7th July 2012, 05:49 PM   #6
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At AF it makes no difference unless they have a DC component or are in close proximity to each other.

At RF the air is acting like a transformer.
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Old 7th July 2012, 08:53 PM   #7
Jay is offline Jay  Indonesia
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I can hear the difference. Most of the time you will want the outer coil to be the input and the inner coil to be the output. I notice that switching power supply consistently do the same for input coil filter, may be for a reason.
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Old 9th July 2012, 03:51 AM   #8
rabbitz is offline rabbitz  Australia
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From an Australian speaker manufacturer and kit supplier, signal in to inner winding.

Probably doesn't matter but if it bothers you, just use the same for both speakers.
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