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Old 11th July 2003, 10:32 PM   #1
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Default does a choke have polarity?

I have just received my first chokes ever. I have seen schematics that show polarity of chokes, but the Hammonds I just got don't show any polarity.

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Old 11th July 2003, 10:38 PM   #2
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typically a choke will not have any polarity
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Old 11th July 2003, 11:35 PM   #3
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Hi,

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but the Hammonds I just got don't show any polarity.
That's just because there isn't any, typically or atypically Joe D.

It may be directive though...not that I'd worry much about that.
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Old 12th July 2003, 12:22 AM   #4
EC8010 is offline EC8010  United Kingdom
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Default Exceptions...

Actually, I have a couple of chokes that are marked to delineate the rectifier end. I assume that this is because the insulation to chassis is better at this end than the other (this would be significant in a choke input supply).

Otherwise, there isn't any "polarity" in chokes.
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Old 12th July 2003, 12:50 AM   #5
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A choke might have a polarity so that the magnetic flux lines are in a certain direction relative to the chassis or some wires nearby.

Also, the core might possibly be designed to react a certain way to the movement of flux in one direction or the other.

Generally, I'd imagine that if the choke itself has no polarization marks, it isn't intended to have polarization and thus should be used how the builder likes.
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Old 12th July 2003, 01:28 AM   #6
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I'd imagine 1) capacitance from end of winding closest to core to the core itself, which is usually chassis-grounded; 2) insulation as EC8010 says; 3) flux orientation is a possibility, though generally a stray field from anything is considered detrimental, but whatever.
Polarity only really applies in transformers or tapped chokes which act as such (autotransformers).

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Old 12th July 2003, 02:13 AM   #7
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Thanks for the response. I couldn't quite remember so I thought I would ask those in the know.

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Old 12th July 2003, 06:48 AM   #8
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How about SE output transformers? Does the same apply?
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Old 12th July 2003, 08:51 AM   #9
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I suppose so, but the more important thing there would be getting the polarity of the audio signal correct and avoiding having one stereo channel out of phase with the other.
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Old 12th July 2003, 01:40 PM   #10
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Chokes that are intended for audio signal usage do have a right way and wrong way to connect them. When used as a plate choke you want the "start" (closest to the core) end of the winding to be at the lowest AC potential, usually an AC ground. The "stop" end of the winding should be connected to the plate of the tube.

The same thing applies to SE transformers.

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