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Polarized vs Mon Polarized Capacitors

Discussion in 'Electronic Repair' started by **THE-RFI-EMI-GUY**, Jun 25, 2006.

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  1. I have a small project to make where I need to provide DC isolation for
    a low impedence audio circuit. I need a non-polarized capacitor of about
    100 uf. Failing this, what would be the impact of two 220 uf polarized
    electrolytic capacitors in series? The latter would be more easily
    obtained. This is a one time project so buying parts in bulk is not an
    option.

    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
  2. ian field

    ian field Guest

    A clamping diode in parallel with each capacitor wouldn't hurt, just to make
    sure reverse charging can't happen!
     
  3. Arfa Daily

    Arfa Daily Guest

    In order to get 100uF with two caps in series, they will each need to be 200
    ( 220 ) uF. I have seen this done many times to produce a bipolar
    electrolytic. Usually, it's the two " - " terminals that are joined, leaving
    the two " + " terminals for connection. I don't know whether there's some
    valid reason for this. I seem to remember reading in the dim distant past,
    that it's something to do with which is the outer foil in the cap, but I
    don't really see why this should make any difference, and I'm sure it won't
    in an audio coupling application. 'Genuine' bipolars are readily available
    in this sort of value.

    Arfa
     
  4. ian field

    ian field Guest

    In my experience non-polar electrolytics have tended to be unreliable,
    expensive & oversized!
     
  5. Jamie

    Jamie Guest

    i've seen many used like that with an encapsulated
    package to make it look like a single.
    btw.
    i could be wrong here but if your looking for
    100 uf then i think you should keep with using
    2 100 uf in series because one is going to short
    while the other charges and they need to be back to
    back of course.
     
  6. Arfa Daily

    Arfa Daily Guest

    Hi Ian
    Yeah, interesting you should say that. They do tend to be bigger, although
    I'm not sure that I've really found them any less reliable. Even given that
    they are bigger, I guess that one of them has still got to take up less
    board space than two regulars back to back, though.

    Arfa
     
  7. Thanks all for the input. Joe

    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
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