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Tool Talk Discussion Forum

Ferrite tube

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Charles in Aus.

03-20-2017 16:41:22

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Can someone please explain the purpose of the Ferrite ' cotton reel' you find in a plastic tube at the end of some electronic equipment's leads ?
They vary from an inch to almost two inches in length and are held in place and covered by a plastic snap together shroud .

I am assuming it has something to do with interference suppression but wonder if they can be safely removed in order to pass cables through small holes .

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Charles in Aus.

03-21-2017 12:55:58

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 Re: Ferrite tube in reply to Charles in Aus., 03-20-2017 16:41:22  
Thanks , another of life's little mysteries solved :)

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03-20-2017 19:22:13

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 Re: Ferrite tube in reply to Charles in Aus., 03-20-2017 16:41:22  
The one at radio shack can be removed and snapped back on. The molded ones like on a high price charger for a camera or phone cannot. They are ment to smooth out any ac ripple from the power supply for sensitive electronics.

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03-20-2017 20:55:56

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 Re: Ferrite tube in reply to jeffcat, 03-20-2017 19:22:13  
Actually, they act as a "low pass filter", filtering out HIGH frequencies, essentially turning it to HEAT!

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