"Pooh Bear" wrote in message
...


bill wrote:

Well, I was pretty sure 18uf was out of the question, but I'm used to
seeing two digits followed by a multiplier. I'm pretty sure they are
METALIZED polyester film. They are in blue plastic. The ones I
substituted from the junk monitors were in white plastic. I'm not
sure the color means anything at all.

Some manufacturers use the plastic colour as a code. Blue is often
polypropylene.
It's not a pulse capacitor is it ? It'll likely need to be polypropylene
in that
case.

Graham


" u18 " is a fairly standard 'alternative' way of writing cap values. It
makes sure that fly crap doesn't get accidentally read as a decimal point.
Thus, a 2.2uF cap will often be seen written as 2u2 so it doesnt get
confused for a 22uF. 4n7 is 4.7nF 6p8 is 6.8pF. You also find it done
with resistors - 4k7 = 4.7k 3M3 = 3.3M 0R68 = 0.68 ohms and so
on.

The "100" after the j is 100v, so strictly speaking, the 63v types that you
have substituted, are not sufficiently rated. Whether that's a problem, will
depend on where exactly they are in the circuit, and what peak voltage they
have across them. Manufacturers usually go for the 'cheap is best' option,
so if 63's would have done in the first place, they probably wouldn't have
fitted 100's.

Arfa