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Discussion in 'Electronic Design' started by GregS, May 9, 2007.

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  1. GregS

    GregS Guest

    I could start looking but I might miss something.
    Looking for a + - 15 volts or therebouts at least 100 ma. supply
    from 9-15 volts input. The key is low in-out capacitance and resistance.
    I really should be using something less than 50 pf. The lowest one
    I have is about 200-300 pf.

  2. GregS

    GregS Guest

    Actually, the Traco measures 86 pf, better than I thought. Still looking for better.

  3. D from BC

    D from BC Guest

    Sorry..I dont understand the question..
    Something is very important is missing..??
    D from BC
  4. GregS

    GregS Guest

    I did find some supplies. About 7 pf I/O capacitance from Traco. Now to see what
    money I need.

  5. Guest

    Power supplies offering galavanic isolation still have some
    capacitance across the isolation barrier - voltage noise on the input
    side will drive some noise current into the output ground connection,
    and vice versa. It can be important to minimise this.

    Ralph Morrison's "Grounding and Shielding Techniques" published by
    Wiley Interscience (John Wiley and Sons) - ISBN0-471-24518-6 - is very
    informative on the subject.

    He liked double-screened transformers, with one screen grounded to one
    side of the isolaton barrier, and the other screen grounded to the
    other side. Cute.
  6. He appears to want a DC-DC converter that has low capacitance between
    the input and the output. Maybe low leakage as well, if that is why
    "resistance" is in there.

    Best regards,
    Spehro Pefhany
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