Capacitance value?

Discussion in 'Electronic Basics' started by z, Nov 9, 2006.

  1. z

    z Guest

    I have opened my Sky Digibox which has stopped working
    and I am having problems reading capacitor values. For
    example, there are many blue blob type capacitors
    (ceramic dipped resin I guess) which I can't understand,
    for example, one has 221K

    I then took it out and measures 1.4nF if I remember
    correctly. What does 221K mean?
    p.s. it was rated at 2kv - is that a switching psu? anyone
    knows how to troubleshoot those?
    (panasonic tu-dsb20)
     
    z, Nov 9, 2006
    #1
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  2. z

    Arlet Guest

    z wrote:

    > I have opened my Sky Digibox which has stopped working
    > and I am having problems reading capacitor values. For
    > example, there are many blue blob type capacitors
    > (ceramic dipped resin I guess) which I can't understand,
    > for example, one has 221K
    >
    > I then took it out and measures 1.4nF if I remember
    > correctly. What does 221K mean?
    > p.s. it was rated at 2kv - is that a switching psu? anyone
    > knows how to troubleshoot those?
    > (panasonic tu-dsb20)


    try google "capacitor codes" ?
     
    Arlet, Nov 9, 2006
    #2
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  3. z

    z Guest

    Arlet wrote:
    > z wrote:
    >
    > > I have opened my Sky Digibox which has stopped working
    > > and I am having problems reading capacitor values. For
    > > example, there are many blue blob type capacitors
    > > (ceramic dipped resin I guess) which I can't understand,
    > > for example, one has 221K
    > >
    > > I then took it out and measures 1.4nF if I remember
    > > correctly. What does 221K mean?
    > > p.s. it was rated at 2kv - is that a switching psu? anyone
    > > knows how to troubleshoot those?
    > > (panasonic tu-dsb20)

    >
    > try google "capacitor codes" ?


    O.k. so what is 221K ?
     
    z, Nov 9, 2006
    #3
  4. z

    Arlet Guest

    z wrote:

    > Arlet wrote:
    > > try google "capacitor codes" ?

    >
    > O.k. so what is 221K ?


    The first link on google "capacitor codes" points to
    http://xtronics.com/kits/ccode.htm, which says in the first couple of
    paragraphs:

    "Now, what about the three numbers? It is somewhat similar to the
    resistor code. The first two are the 1st and 2nd significant digits and
    the third is a multiplier code. Most of the time the last digit tells
    you how many zeros to write after the first two digits, but the
    standard (EIA standard RS-198) has a couple of curves that you probably
    will never see. But just to be complete here it is in a table."

    The single letter at the end is explained a bit further down the page.
     
    Arlet, Nov 9, 2006
    #4
  5. z

    Eeyore Guest

    z wrote:

    > I have opened my Sky Digibox which has stopped working
    > and I am having problems reading capacitor values. For
    > example, there are many blue blob type capacitors
    > (ceramic dipped resin I guess) which I can't understand,
    > for example, one has 221K
    >
    > I then took it out and measures 1.4nF if I remember
    > correctly. What does 221K mean?
    > p.s. it was rated at 2kv - is that a switching psu? anyone
    > knows how to troubleshoot those?
    > (panasonic tu-dsb20)


    It's the value in pF as follows. The first and second numbers are the first part
    of the value and the last digit is the number of trailing zeros.

    So 221 = 220 pF

    The K is a tolerance letter ( 10% ).

    The cap you mention sounds like a snubber cap in a switch mode psu.

    Graham
     
    Eeyore, Nov 10, 2006
    #5
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