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metal ring

Discussion in 'General Hardware' started by Willbo, 9 Jul 2006.

  1. Willbo

    Wise Guy

    Joined: 28 Jul 2004

    Posts: 1,219

    Location: Solihull, Birmingham

    just found a small metal ring about the size of a £2 coin. i'm sure i got it with my PSU, but whats it for? SOrry for sounding so dumb but :rolleyes: its sunday night
     
  2. squiffy

    Banned

    Joined: 17 Mar 2006

    Posts: 9,155

    Possibly a RFI choke?
     
  3. Jokester

    Don

    Joined: 7 Aug 2003

    Posts: 41,576

    Location: Aberdeenshire

    It'll be a ferrite core for limiting EMI interference from the PSU propagating down the various cables into your PC.

    Jokester
     
  4. Willbo

    Wise Guy

    Joined: 28 Jul 2004

    Posts: 1,219

    Location: Solihull, Birmingham

    so to be dumb again......1) how do i fit it? the holes not that big.......2)what cables does it go around priority wise?
     
  5. semi-pro waster

    Man of Honour

    Joined: 27 Sep 2004

    Posts: 25,829

    Location: Glasgow

    It has always been around all the front connector cables on any case that I have ever bought, how necessary it is I'm not sure but there isn't any harm in it.
     
  6. Jokester

    Don

    Joined: 7 Aug 2003

    Posts: 41,576

    Location: Aberdeenshire

    Normally it should be fitted at the bit where all the cables come out of the PSU, but if it's not already fitted then I'm not sure how you're going to get it on.

    Jokester
     
  7. cobxx

    Gangster

    Joined: 22 Jun 2006

    Posts: 276

    IIRC it's around the front panel connectors, not entirely sure how, but it's used to reduce EMI interferance. It could have come off when replacing the connectors or something...but it's not essential.
     
  8. semi-pro waster

    Man of Honour

    Joined: 27 Sep 2004

    Posts: 25,829

    Location: Glasgow

    We might be thinking of different things here but I'm envisaging the small 'doughnut' shaped bit of metal that goes over the front connector cables to the motherboard, I'm not sure about anything that goes over the PSU cables directly.
     
  9. Willbo

    Wise Guy

    Joined: 28 Jul 2004

    Posts: 1,219

    Location: Solihull, Birmingham

    yeah sounds about right, i think i remember seeing similar in old pc cases around the front connectors......do i just put the cables through the ring or in a special way?
     
  10. bitslice

    PermaBanned

    Joined: 18 May 2006

    Posts: 9,041

    the cables are wrapped around it at least once,

    more turns = greater inductance = ~more RF rejection



    sara's mum uses ferrite cores
    sara's mum is really cool


    .