[Elecraft] Re: Capacitor Markings.

[Ingo Meyer DK3RED]

Hello John,

> I know that NPO means its supposed to not drift when it gets hot but what
> about the rest?  Maybe a lil more detail please?

A temperature coefficient of i.e. N750 means -750 ppm/�C. So the nominal value 
of the capacitor will decrease (N = negative) of 750 parts of a million (ppm) 
if the temperature increase 1 degree.

A sample? You use a capacitor with 100nF at 20�C with a temperature 
coefficient of N750 and you want to know the change and right value at 25�C 
(temperatur difference = 5 degree).

          750 x 100nF x 5
change = --------------- = 0.375nF = 375pF
          1,000,000

value at 25�C = 100nF minus 375pF = 99.625nF

P.S. I hope I have no typo in my calculation. ;o)

-- 
72/73 de Ingo, DK3RED   Don't forget: the fun is the power!

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