# How can I identify the values of recycled mylar and ceramic capcitors using the codes on the side?

I have desoldered a couple of old radios etc. and am trying to identify all the components I have harvested.

Amongst them I have some green mylar caps. One such cap has the markings: 2A473J

I did a bit of research and found out that usually the first two numbers is the significant figures and the third is the number of zeros. Assuming its not counting the 2A, I'm guessing this cap is 47000pF or .047μF. and I found out that the J is +/-5% tolerance?

Firstly, is everything I have worked out/ assumed true and if so and the cap is .047μF, what does the 2A mean?

Others say 2A73J, 2A103J, 2A332J, 2A222J, 2A102J

Ceramic ones say 4, 22, 30, 33, 102, 103, 104, 203, 221, 222, 331, 332, 333, 473, 682, 683

And I also have 4 of another type of cap that I don't know the name of- they are shown in the 3rd picture.

the two smaller ones say 474 on, one say 8.0M and the other:16.93M

Thanks in advance

Amongst them I have some green mylar caps. One such cap has the markings: 2A473J

I did a bit of research and found out that usually the first two numbers is the significant figures and the third is the number of zeros. Assuming its not counting the 2A, I'm guessing this cap is 47000pF or .047μF. and I found out that the J is +/-5% tolerance?

Firstly, is everything I have worked out/ assumed true and if so and the cap is .047μF, what does the 2A mean?

Others say 2A73J, 2A103J, 2A332J, 2A222J, 2A102J

Ceramic ones say 4, 22, 30, 33, 102, 103, 104, 203, 221, 222, 331, 332, 333, 473, 682, 683

And I also have 4 of another type of cap that I don't know the name of- they are shown in the 3rd picture.

the two smaller ones say 474 on, one say 8.0M and the other:16.93M

Thanks in advance

active| newest | oldestFor example: if you've got a capacitor that has 104 printed on the side, then this means 10 multiplied by 10 to the 4th picofarads

= 10*10^4*(10^-12 F)

= 10^-7 F = 0.1 *10^-6 F = 0.1 microfarads

As another example, 222 means 22*10^2 picofarads = 2.2*10^-9F

= 2.2 nanofarads

and the third photo-they say 8.0M and 16.93M?

http://www.sentex.ca/~mec1995/gadgets/caps/caps.html

The ones with a M suffix might be ceramic resonators,

http://en.wikipedia.org/wiki/Ceramic_resonator

in which case I think the M stands for "megahertz".

Nevermind- i'll just pretend it isn't there ;)

Also I read that J is the tolerance??

http://wiki.xtronics.com/index.php/Capacitor_Codes

says, and I found that place just now, via Google(r).

I have seen some bypass disc caps rated as low as 12.5VDC

for 5V system ICs.

A