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Self chargeing capacitors?

Discussion in 'Electronic Basics' started by [email protected], Aug 15, 2005.

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  1. Guest

    I recently finished building my Zagi 400, a remote controlled airplane.
    I used a "12" volt 300 ma charger to charge the battery. I took my volt
    meter to make sure of the polarity before hooking up an expensive
    battery. I know by taking a charger apart that there is a capacitor
    inside. When i unpluged the transformer, the capacitor would slowly
    discherge. I would short the two leads, the voltage would drop to zero,
    but as soon as i unshorted them the voltage would slowly climb into the
    tenths of volts range, if i had been more patient it might Have reached
    a whole volt. Whats going on here?
     
  2. The Phantom

    The Phantom Guest

    It's a phenomenon known as dielectric absorption. Go have a look at:

    http://www.tpub.com/celec/55.htm


    and

    http://www.sencore.com/custsup/pdf/TT105.pdf
     
  3. JeffM

    JeffM Guest

    It's a phenomenon known as dielectric absorption. Go have a look at:
    I am amazed that you actually directed someone to that spammer's site.
     
  4. Maybe he didn't know (I didn't). I do know that they once provided a
    lot of stuff for free that now requires payment. The page in question
    is at least informative, or so it appears.

    Tom
     
  5. JeffM

    JeffM Guest

    Go have a look at: http---tpub---
    That's the 1st time I've seen a link to that domain that was useful.

    The site owner has been trolling these groups
    trying to stir up traffic for his site
    but not being helpful in any way.
    All he gives are vague links. Once at his site,
    you have to give him at least 2 more page hits
    to actually get to anything useful.

    He's just a self-serving jerk.
     
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