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What can happen if a Wall Adapter Fails?

Discussion in 'Electronic Basics' started by royalmp2001, Feb 16, 2005.

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  1. royalmp2001

    royalmp2001 Guest

    For safety reasons, I need to know what are the REALISTIC chances of
    120V appearing at the output of a failed basic 12V wall adapter.

    I would have thought most likely the secondary or primary winding would
    most likely go open-circuit, or the smoothing electrolytic cap or
    bridge rectifier go open or short circuit....so I'm hoping that at
    worst you get 0V at the output.

    Can someone tell me the chances of a dangerous situation occuring.
    What safeguard could I incorporate? Would a GFCI protector do the job?
    Could I build a discreet GFCI into my circuit? Any ideas?

    I intend to produce a commercial project powered with a wall adapter
    that connects upto the human body.

    Thanks
     
  2. Rich Grise

    Rich Grise Guest

    If I do your research for you, do I get paid commensurately?

    Thanks,
    Rich
     
  3. Lord Garth

    Lord Garth Guest

    Years ago, the phone company supplied some AC output wall warts to run
    the dial lights in certain models of their phones. A recall occured because
    these molded wall warts were, in some cases, overheating and becoming
    potential fire starters.
     
  4. dB

    dB Guest



    The regulations applicable to mains powered equipment for medical use
    are very stringent, at least in the U.K.
    Check your local regulations.
    I doubt very much that an ordinary wall adapter would meet the
    requirements.
     
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