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Thread: Breaking earth loops

  1. #21
    Join Date: Oct 2012

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    I'm Alan.

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    Quote Originally Posted by bumpy View Post
    I'm struggling too. If you put a resistor between the ground of the cable and a case that is not connected to earth, then its seems no better than inserting a resistor and dangling the other end in fresh air.
    I agree, I think Ali is suggesting that the resistor is inserted in the 'ground' connection out to the output sockets.

    As far as an earth lift goes in an earthed case system, the extra resistance between the signal ground loop and the earth loop forces any current that is flowing to flow in the earth connections between cases, rather than the signal connections, thus reducing the 50Hz currents to virtually zero.

  2. #22
    Join Date: Apr 2016

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    Quote Originally Posted by Firebottle View Post
    I agree, I think Ali is suggesting that the resistor is inserted in the 'ground' connection out to the output sockets.

    As far as an earth lift goes in an earthed case system, the extra resistance between the signal ground loop and the earth loop forces any current that is flowing to flow in the earth connections between cases, rather than the signal connections, thus reducing the 50Hz currents to virtually zero.
    I think that is clearer !!
    Let me try this. If I take a wire from one of the cable earths through a resistor and then to the mains earth is this the same.?
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  3. #23
    Join Date: Jan 2009

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    Quote Originally Posted by The Black Adder View Post
    Also, using a passive with transformers will also break the earth loop.

    I had a passive once which did just that.

    Sent from my 9001X using Tapatalk
    Transformers will only provide galvanic isolation, that is isolation from DC. Any alternating current fed to the primary (such as 50Hz mains 'hum' and its harmonics) will be simply transferred to the secondary winding of the transformer.

    I once had a mild hum problem with an AV set up. Using a 1:1 transformer did not help. The only cure was to trace the earth loop and break it.
    Barry

  4. #24
    Join Date: Apr 2008

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    I wonder if itís an interconnect related issue, specifically with how the shields are being grounded.

    What interconnects are you using?
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  5. #25
    Join Date: Oct 2012

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    Quote Originally Posted by bumpy View Post
    I think that is clearer !!
    Let me try this. If I take a wire from one of the cable earths through a resistor and then to the mains earth is this the same.?
    Only providing the cable earth isn't directly connected to mains earth, this is where the 'earth lift' comes in.

  6. #26
    Join Date: Apr 2016

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    Quote Originally Posted by Firebottle View Post
    Only providing the cable earth isn't directly connected to mains earth, this is where the 'earth lift' comes in.
    Great I'll give that a go. Some googling suggest a capacitor in parallel to the resistor is a good idea. Don't know why?
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  7. #27
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    Quote Originally Posted by bumpy View Post
    Great I'll give that a go. Some googling suggest a capacitor in parallel to the resistor is a good idea. Don't know why?
    Coz it blocks DC.
    Chris



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  8. #28
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    At times I've experienced horrendous or minor hum and scratched my head searching for causes, blaming it on earth loops, bad components and all else between. So far as I recall the hums went away by realigning interconnects and speaker cables, often only by a small amount. What I call 'jiggling'.

    I offer no explanation as to why (I'm not an electronics engineer), just what I found (so far).

    caveat: YMMV.
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  9. #29
    Join Date: Apr 2016

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    Quote Originally Posted by Yomanze View Post
    I wonder if itís an interconnect related issue, specifically with how the shields are being grounded.

    What interconnects are you using?
    I use Klotz cables around the DSP circuit. These are certainly quieter than the Audionote silver cables I used before.
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  10. #30
    Join Date: Apr 2016

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    Quote Originally Posted by Stratmangler View Post
    Coz it blocks DC.
    Is this a worthwhile thing to do?
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    ICE 1000ASP driving vintage 15" Altec VOTT 416 bass drivers via MiniDSP Digital Sound Processor
    Silver mains cables, interconnects and speaker cables by SW1X

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