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Need Help with capacitor markings

Discussion in 'Electronic Basics' started by Joe, Jul 25, 2004.

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  1. Joe

    Joe Guest

    I have a few aluminum electrolytic caps that I took out of disposable flash
    cameras. They are not marked with how many microfarads and voltage info,
    just some numbers. I don't know why, there's plenty of room on them, but
    does anyone know where I can find a site or source that will explain to me
    what these markings mean?

    I have googled for 'capacitor markings' and 'electrolytic capacitor
    markings' and found some stuff but nothing that really explains what the
    numbers mean, except for the small ceramics . I have a bunch of these and I
    am going to start using them in one of my hairbrained projects soon but
    didn't want them to explode. For example, they all have markings showing
    where the negative terminal is, but then one has numbers on it as follows:
    9649K, another says 589. They are from flash cameras, so they probly have
    a pretty hefty voltage (couple of hundred volts) rating, but I would like to
    know the capacitance if that info is possible to find out from these
    numbers?

    TIA,
    Joe
     
  2. Jerry G.

    Jerry G. Guest

    Most of the manufactures of these flashes use house numbers on their parts.
    Get a hold of a capacitor meter, and take a reading of the cap. This is the
    best way to know the capacitance.

    The meter cannot tell you the maximum rated voltage of the cap. The voltage
    rating of most flash caps is usually in the order of about 350 Volts and up.
    I have seen many in the 400 to 450 Volt range.

    --

    Jerry G.
    ==========================


    I have a few aluminum electrolytic caps that I took out of disposable flash
    cameras. They are not marked with how many microfarads and voltage info,
    just some numbers. I don't know why, there's plenty of room on them, but
    does anyone know where I can find a site or source that will explain to me
    what these markings mean?

    I have googled for 'capacitor markings' and 'electrolytic capacitor
    markings' and found some stuff but nothing that really explains what the
    numbers mean, except for the small ceramics . I have a bunch of these and I
    am going to start using them in one of my hairbrained projects soon but
    didn't want them to explode. For example, they all have markings showing
    where the negative terminal is, but then one has numbers on it as follows:
    9649K, another says 589. They are from flash cameras, so they probly have
    a pretty hefty voltage (couple of hundred volts) rating, but I would like to
    know the capacitance if that info is possible to find out from these
    numbers?

    TIA,
    Joe
     
  3. Joe

    Joe Guest

    Thanks Jerry,

    My capacitance meter only goes up to 100uF. Maybe if I put them into a
    circuit with a known inductor and sweep a signal till I get resonance, then
    calculate. That might work, I have done it with unknown inductors before.

    Joe
     
  4. C

    C Guest

    It's probally not much help, but I have some flash camera capacitors. They
    are made by Rubycon and are rated at 330V and 120uF. To get the voltage I
    would just measure the voltage the camera supplies to the capacitor (if you
    have access to the circuit). It's probally not the maximum voltage, but it
    would still be high (I guess).
     
  5. Joe

    Joe Guest

    Hey C,

    Thanks. Yes, I have a few rubycons, they are in the kodak max flash cameras.
    These were from some no name camera.

    The physical size of my unknowns is not that much different, but I don't
    think I will need to charge them past 250V anyway.

    Joe
     
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