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10 µF/25V Tantal Instead of 22µF/16V - In circuit

Discussion in 'Electronic Basics' started by [email protected], May 31, 2005.

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  1. Guest

    Hi All,

    I am building a PIC programmer (JDM Programmer) described here:
    http://www.jdm.homepage.dk/newpic.htm

    It uses a 22µF/16V Tantal Capacitor in the circuit.

    I am unable to get this capacitor in the town where I live;

    By any chance I can use a 10 µF/25V instead? or maybe 2 in paralell?

    I really do not know What Tantals are- for that matter my general
    electronics knowledge is pretty limited.

    I'd appreciate if anyone could throw some light on that too.

    Many Thanks
    Suraj
     
  2. PeteS

    PeteS Guest

    The 22uF capacitor is not particularly critical. The real issue with
    tantalums is surge currents. In this case, those currents would be
    rather minimal.

    One of the advantages of tantalums over electrolytics is their low ESR
    (there are threads about it). For this circuit you could probably use
    10uF at 25V (this is being connected to a RS232 circuit which is why
    the voltage rating is a little high) as nothing in it is particularly
    critical.

    So go ahead and use the 10uF/25V part - you should be fine. If you get
    issues, then just drop a second one in parallel, although I don't think
    you'll need it. (IMO)

    Cheers

    PeteS
     
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