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Basic question

Discussion in 'Electronic Design' started by Jimbo, Jun 28, 2006.

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  1. Jimbo

    Jimbo Guest

    Is there a definition as to what constitutes an "isolated" vs.
    "non-isoldated" circuit? What does this really mean? This is what I
    think the definition really is:

    A system S1 has an input V1,In referenced to V2,In and an output V1,out
    referenced to V2,out whereas V1,In - V2,In has an operating limit of L1
    and V1,out - V2,out has an operating limit of L2.

    Is an isolated system a system that can have the references V2,In and
    V2,out such that |V2,In - V2,out| >> 0 and still operate properly? If
    so what value of |V2,In - V2,out| constitutes an "isolated system"?

    Does anyone know of a formal definition of an "isolated" system? I
    know that usually it's some kind of LED operating on some kind of
    photo-sensitive device, but is that what the definition is limited to?
    I don't think so because a "relay" is usually called an isolated
  2. Jimbo

    Jimbo Guest

    opps, sorry for the double post...I tried to correct a spelling error.
  3. Phil Allison

    Phil Allison Guest


    ** "Isolated" usually refers to "galvanic isolation" where no
    *electrically conductive* path exists between the devices or circuits

    There is "transformer isolation", "optical isolation", "relay isolation"
    .... etc

    Using a coupling capacitor between two circuits produces " DC isolation ".

    Like most tech terms, the meaning cannot be defined OUT OF CONTEXT !!

    FORGET trying to do that !!!!

    ** Yawn.....

    ** A relay provides "galvanic isolation" between the driving and switched

    ........ Phil
  4. An isolated circuit is one that has a very high resistance to what it
    is isolated from. The contacts in a relay are isolated from the coil
    wire by the wire insulation, the bobbin the wire is wound on, and the
    insulation holding the contacts away from other things. All isolation
    has some voltage limit, above which current will take a short cut
    around the insulation and surface track or arc.
  5. Jimbo

    Jimbo Guest

    The reason I'm asking is because I have a circuit with two "floating"
    inputs but there is a point where the material breaks down. So,
    according to your definition this is not "isolated".
  6. Phil Allison

    Phil Allison Guest

    ** Google Groper Fuckwit Top Poster Alert !!

    ** Learn to post facts and describe things adequately.

    ** There ALWAYS is.

    That's why all real devices have RATINGS - you bloody FOOL

    ** You are seriously mentally defective.

    GO AWAY !!

    ........ Phil
  7. Jimbo

    Jimbo Guest

    Thanks for you help Phil.
  8. Grumps

    Grumps Guest

    So what do you need to know? Do you want a definition of isolation, or an
    explanation of why your circuit falls over?
  9. Guest

    Phil, you need some hard man-love to relieve your tension. Come to
    Montreal, I'll show you where to go. You might want to come here in the
    first week of August. We accept autistic Touretters like you. Bring
  10. Luhan

    Luhan Guest


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