matching capacitors

Discussion in 'General Electronics Chat' started by abNORMal, Mar 21, 2009.

  1. abNORMal

    Thread Starter New Member

    Mar 21, 2009
    3
    0
    Hi All. Noob here. No particular electronics background (as you'll see), just a hobbyist.

    I have a subwoofer that was doing nothing but cracking/popping, so I opened it up and found 3 leaking capacitors. I'm trying to buy replacements, but I don't know a damn thing about this, so I come to you.

    The ones I ID'd are:
    10 uf 35 volt 105 degree 11mm high
    100 uf 16 volt 105 degree 11mm high
    2200 uf 200 volt 105 degree vented 45m high

    Questions are:
    The first 2 I can find what appear to be matches for on this site

    http://www.alliedelec.com/Search/Pr...576&SEARCH=8526576&DESC=SK100M035ST#tab=Specs

    http://www.alliedelec.com/Search/Pr...ST&R=8527004&SEARCH=8527004&DESC=SEK101M016ST

    but I can't seem to match up the third one.

    How close do I have to be? I can find one that has the right numbers, but it's not vented. It's also shorter and the pins seem to be a little closer. Ones listed are 10mm apart. Mine are more like 12 mm apart.

    http://www.alliedelec.com/Search/Pr...&R=8620995&SEARCH=8620995&DESC=SLP222M100C4P3

    This one seems closer, but there's no image:

    http://www.futureelectronics.com/en...oductID=228LBA100M2CGILLINOISCAPACITOR8223596

    So, if the capacitance, voltage and temp match, it that good enough?
     
  2. flat5

    Active Member

    Nov 13, 2008
    403
    17
  3. abNORMal

    Thread Starter New Member

    Mar 21, 2009
    3
    0
    Hi flat5

    If that image is at all accurate, I don't think it'll do. It also lists the temp at 85 d, so that also doesn't match, but I don't know how critical that is.

    btw I meant the last link. The SLP222M100C4P3 looks like more of a match
     
    Last edited: Mar 21, 2009
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The capacitors in a speaker crossover operate with AC, not DC. So they must be non-polar.
    The capacitors you found are polarized for operating only on DC so they will blow up if used with the AC signal of a speaker.

    Digikey used to sell non-polar electrolytic capacitors.
     
  5. abNORMal

    Thread Starter New Member

    Mar 21, 2009
    3
    0
    Audioguru

    Thanks. This is the stuff I need to know. Thinking on this a bit, it isn't really a crossover. It's a powered subwoofer. There's only one speaker.

    What is polarized/non-polarized? These look like run of the mill cans with a stripe on one side. I thought that indicated polarity.
     
    Last edited: Mar 22, 2009
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