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    #1

    cap question

    new member,just to ask,recently i bought one faulty mother board EPOX,
    capasitor,damaged, size of capacitor is 1200uf 6.3v, but i changed to 2200uf 10.0v,now the board is running smooth..can anyone explain to me..the diffrence of capasitor.i'm not good enough about capasitor and it's capacities.generally 2200uf stands for what? and 10.0v?.hopefully someone will help to explain.


    thanks,
    cappanie
    Tags: None
    #2
    Re: cap question

    v=voltage.safe to go higher but not lower.
    uf=capacitance in microfarads.
    in many cases going higher helps.vrm output may be cleaner.if its working good use it.

    Comment

      #3
      Re: cap question

      gerneraly, we have 3 Things to care for caps :

      uF, V and ESR and manufakturer.
      The uF determins the capazitance of the capazitor e.g. how mutch energie it can store.
      The voltage rating is the max voltage which should be aplied without dammage or mutch leakage current. In generall higer is possible but could decrease nonminal capacity lower is alway bad. In any case it depends on the real applied voltage.
      The ESR determins the resistance and therefore the loss of energy (e.g. voltage drop if the caazitor will be discharged). This is specially important for VRM and PSU units like on motherboard and PSU`S. The lower the better in most cases.

      The manufakturer let us say if the cap will last long or not as the quality varies.

      Comment

        #4
        Re: cap question

        Originally posted by gonzo0815
        gerneraly, we have 3 Things to care for caps :

        uF, V and ESR and manufakturer.
        The uF determins the capazitance of the capazitor e.g. how mutch energie it can store.
        The voltage rating is the max voltage which should be aplied without dammage or mutch leakage current. In generall higer is possible but could decrease nonminal capacity lower is alway bad. In any case it depends on the real applied voltage.
        The ESR determins the resistance and therefore the loss of energy (e.g. voltage drop if the caazitor will be discharged). This is specially important for VRM and PSU units like on motherboard and PSU`S. The lower the better in most cases.

        The manufakturer let us say if the cap will last long or not as the quality varies.
        let say the voltage is 12v,and i'm fixing capasitor, equivalent to 10.3v,2200uf the capasitor will burst?,damage? or supply more power?

        Comment

          #5
          Re: cap question

          My experience says that cap will burst, and stand away when it does.
          Jim

          Comment

            #6
            Re: cap question

            I don't know about the 8mm, 10mm, or 12.5mm diameter caps, but larger ones might take a few minutes or more to vent with that moderate an over-voltage.
            PeteS in CA

            Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
            ****************************
            To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
            ****************************

            Comment

              #7
              Re: cap question

              Originally posted by arneson
              My experience says that cap will burst, and stand away when it does.
              means,i have to apply 10.3v or lower?

              Comment

                #8
                Re: cap question

                Originally posted by cappanie
                means,i have to apply 10.3v or lower?
                The voltage marked on the cap is the rated voltage
                ( or working voltage ) at which it supposed to be run fine
                during its intended lifespan under the specified temp.

                For I/P of VRMs, the voltage is 12V. M/B mfr usually use
                16V caps. For O/P of VRMs, it is customary to use 6.3V.

                In your case, replacement of 6.3v to 10v is ok
                whereas 10v in lieu of 16v is not. ( there is no caps
                rated at 12V , mfr just use 16v )
                ******************************************

                Comment

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