Capacitance value?

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

1. zGuest

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)

3. zGuest

O.k. so what is 221K ?

4. ArletGuest

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.

5. EeyoreGuest

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