Capacitor color codes are always in picofarads, never microfarads.
Capacitors in microfarads other than decimal fractions are never used at
RF.
So you have 2500 pf. Each dot, or ring or spot sets a decimal digit. The
are only added after left shifting.
E.g. first digit, but there's another digit so left shift the 2 a column
and add the 5. Gives 25. Red means multiply by 100, generally so makes
2500 pf (.0025 uf).
a green dot may mean 5%. Each maker of capacitors has his own way, and
then each country has its own way. There's only one way to be sure of a
capacitor and that is with a bridge or the particular makers
spedifications.
I've never seen electrolytic capacitors (the only useful capactors much
larger than a microfarad) with color codes.
Number codes also vary in a confusing manner. Some are the actual
capacitor value, some are two digits and a zero count like color codes.
And they wander even with the same maker.
73, Jerry, K0CQ
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