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Big surplus capacitors: are they reliable?

Discussion in 'Electronic Components' started by s&r, Jul 10, 2003.

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  1. s&r

    s&r Guest

    I've a bunch of big electrolytic capacitors I bought
    new many years ago at a surplus market and never used.

    since I've no equipment to test their high capacitance
    (they go from 25,000 to 110,000 microfarads, 25 to 60 Vcc),
    besides simple discharge timings, I wanted to test their
    reliability before using them.
    I measured the current they draw from a 12 Vcc power
    supply after being fully charged and got values of 150
    microamperes or less.
    Could I trust these capacitors? Are there better
    methods to test if they're still usable without risk?


    Thanks in advance.
     
  2. You ought to do a bit of electrolytic capacitor reforming. They
    should be gradually brought up to their rated voltage.

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  3. Connect them all to a power supply with a current limiting resistor
    like 10k, and let them stay there for a week. Then they will be
    formatted. Nowadays those caps are so good that there will
    not be much problems. You can see if the formatting has ended by
    measuring the current. It will get lower and lower. Once it stops you
    reached the leakeage current.

    Regards,

    Pieter Hoeben
     
  4. Being that they are old capacitors, should
    one "format" them FAT-16, or try to "FORMAT" them FAT-32? :)
     
  5. B-b-but what if they're a CD? Then it's ISO-9660?


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    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
  6. Being that they are old capacitors, should
    They are old, so probably C/PM. A ask Bill how to copy it to make
    MSDos.

    Pieter Hoeben
     
  7. Mark (UK)

    Mark (UK) Guest

    Could be Linear CDi, or CD Video even?
     
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