Ceramic Capacitors: How To Read 2-digit Markings?
Answer : The brown capacitors have values in picoFarads eg 47 = 47 picoFarad = 47 pF = 0.000 000 000 047 Farad ! 10 = 10 pF For the yellow and green capacitors with markings of the form anb Here n = nanoFarad = nF. 1n0 = 1.0 nF 2n2 = 2.2 nF 6n8 = 6.8 nF Note that the use of xNx here is (probably) unqiue to capacitors in the nF range - I do not recall seeing eg xPx or xUx markings ever. However page 70 of this superbVishay ceramic single layer capacitors document suggests you might expect to meet any of eg p68 = 0.68 pF n15 = 0.15nF = 150 pF 5p0 = 5 pF etc The green dot is quite likely to be a voltage rating, but alas I don't know what system it uses. There are several different colour/voltage systems. Typically this sort of capacitor is 50 Volt rated but this is not certain. More usual nnX 3 digit markings Most capacitor numerical markings are 3 digit and express the value in pF (pico Farad = 10^-12 Farad) with the last digit being a ...