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 Post subject: ferrites
PostPosted: Sat Jul 21, 2018 7:40 am 
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Joined: Sun Dec 03, 2006 6:45 am
Posts: 86
Location: bedford, NS, CA
Can anyone tell me how they are used....where are they placed....and what they are for?


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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 8:10 am 
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Joined: Mon Jun 20, 2011 6:19 pm
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Location: Eastern Passage, NS, CA
https://en.wikipedia.org/wiki/Ferrite_%28magnet%29

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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 8:17 am 
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Joined: Thu Jan 13, 2011 11:29 am
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Location: St.Catharines, ON, CA
Assuming ferrite beads.
Used for RFI/EMI filtering.
Mostly in low level circuits like microphone,phono preamps.

G


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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 8:24 am 
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Joined: Fri May 18, 2018 6:35 am
Posts: 438
Location: Toronto, ON, CA
Typically the clamp-on style for cables is the hail Mary for trying to get a piece of gear to pass EMC emissions testing. TUV's lab up in Gormley has bins of various types that has accumulated over the years...When I see gear that has cables festooned with big ferrites I know the electronics was poorly designed...

https://www.we-online.com/web/en/passiv ... 108020.php


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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 10:47 am 
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Joined: Mon Mar 31, 2008 9:17 am
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Location: Toronto, ON, CA
You see them a lot on corded power tools that use a commutator. The ferrite bead prevents the cord from acting as an antenna broadcasting the radiation generated by the commutator. This is bigger deal nowadays with digital transmission through wifi, etc.

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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 11:11 am 
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Joined: Wed Jul 23, 2008 5:04 pm
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Location: saskatoon, SK, CA
Is the op wanting to know the possible benefits or detriments of using ferrite beads on power cords, ic's??
I've had a few components (mainly TVs or monitors) that included the snap on bead for the IEC cord.

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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 11:20 am 
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Joined: Wed Apr 28, 2010 2:00 pm
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Location: Rio Rancho, NM, US
Many moons ago before I upgraded(?) to various high-end power cords I used ferrite chokes on all of my standard IEC removable cords. I never bothered to do a proper before-and-after A/B comparison. I just assumed that the chokes would improve the sound by absorbing stray RF/EMI. That is until I starting reading up on the subject. Apparently in certain circumstances these chokes can do more harm than good. YMMV.

https://forum.audiogon.com/search/index ... ry=ferrite

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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 6:36 pm 
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Joined: Thu Sep 22, 2005 4:25 pm
Posts: 862
Location: Hamilton, ON, CA
Ferrets are great pets.

Seriously though - what interests you about them?


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 Post subject: Re: ferrites
PostPosted: Sat Jul 21, 2018 7:34 pm 
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Joined: Wed Aug 15, 2012 7:16 pm
Posts: 1224
Location: Kelowna, BC, CA
JGP wrote:
Ferrets are great pets.

Seriously though - what interests you about them?


A lost pet ferret came wandering into our living room once! Cute little bugger but scared the bejeezus out of the Mrs.

I'd seen the poster on the local telephone poles from the owner so it was reunited with it's owner.

Anyways back to the less amusing topic of ferrites!

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 Post subject: Re: ferrites
PostPosted: Sun Jul 22, 2018 7:09 am 
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Joined: Wed May 07, 2014 9:38 am
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Location: Edmonton, AB, CA
No seriously does anybody know the theory behind these things? They came with my tv's , some of my stereo equip. to. I have them attached at the ends of all my hdmi chords. Have some left over I could use on my electrical chords, would they help in some way? Is anybody out there who actually knows about these things.


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 Post subject: Re: ferrites
PostPosted: Sun Jul 22, 2018 8:08 am 
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Joined: Fri Apr 01, 2005 7:15 am
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Location: Newmarket, ON, CA
https://en.wikipedia.org/wiki/Ferrite_bead

Google, searched "ferrite cable clamps" ... 2nd item (after an Ad).


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 Post subject: Re: ferrites
PostPosted: Sun Jul 22, 2018 10:56 am 
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Joined: Wed Sep 14, 2005 11:47 am
Posts: 3985
Location: Ottawa, ON, CA
ripblade wrote:
You see them a lot on corded power tools that use a commutator.


Here's an interesting test - try connecting a scope to the supply rails of an amp.

Plug in an electric hand drill and turn it on.

See what happens to the poor old supply rails.


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