Just a quick question about capacitors

Discussion in 'General Electronics Chat' started by filonin_2, Jun 3, 2009.

  1. filonin_2

    Thread Starter New Member

    May 29, 2009
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    Can I substitute a 1uf electrolytic capacitor for a ceramic one?
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
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    513
    Maybe.

    Electrolytic capacitors are generally polarised. That means they have a positive and negative connection and are designed to work with a specific DC voltage across them.

    Ceramic ones are unpolarised. This is why they are used in crossovers and the like.

    However you can get or make unpolarised electrolytics. You make one by putting two in series with each other, one reversed. This is called 'back to back'. Of course you will half the capacitance so need two 2.2μF capacitors.

    connect thus -_+ +_-

    At a real pinch, an electrolytic will work for a while without a polarising voltage though its value will be uncertain.
     
  3. filonin_2

    Thread Starter New Member

    May 29, 2009
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    0
    Thank you! Space is limited so I'll just go get a ceramic one.
     
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