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capacitor code

post #1 of 13
11/7/09 at 11:01pm
Thread Starter 
hello everybody,

i'm stuck again with those ceramic capacitors,

i have a few prints and i don't know what they mean.
they don't have numbers all the way, i'm confused
so can somebody explains me how it works.

here are the caps i have (i try to solve them)

100 = 10pf
k2j= ?
k1j= ?
k1k= ?
104 = ? 10 0000 pf ?
221 = 220pf


thanks guys
greetz
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post #2 of 13
11/7/09 at 11:03pm
Try this

Capacitor Value Calculator
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post #3 of 13
11/7/09 at 11:31pm
There's at least half a dozen different schemes. Mostly apply to a specific type of capacitor, but not always. Here's a few examples.

Color codes for Capacitors
BEAM Pieces -- Capacitor part codes
Capacitor Technical Information

The best thing to do is check or throw out anything you can't identify for sure, and always label what you have.
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post #4 of 13
11/7/09 at 11:33pm
Do you have a DMM? Measure them.
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post #5 of 13
11/8/09 at 2:21am
Quote:
Originally Posted by Uncle Erik View Post
Do you have a DMM? Measure them.
Please explain how a standard DMM will tell you the capacitance?
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post #6 of 13
11/8/09 at 2:25am
I'm pretty sure capacitor codes are standard. They're just like resistor color codes. Take the first two numbers and multiply them by the 10 to the power of the third number. Basically the third number is how many zeros to add after the first two. They're measured in pF (1000pF=1nF, 1000nF=1uF).
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post #7 of 13
11/8/09 at 2:28am
I don't know any cheapo DMM that will do it but this baby will. I want one.
Fluke 113 Utility Multimeter
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post #8 of 13
11/8/09 at 3:39am
The 3-digit capacitance code is fairly standard, but the other codes are usually manufacturer-specific. You should check the datasheet for details. In the OP's example, it looks like a Kemet multilayer ceramic and the datasheet has all that you need to know.
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post #9 of 13
11/8/09 at 2:40pm
Quote:
Originally Posted by m1abrams View Post
Please explain how a standard DMM will tell you the capacitance?
The real el-cheapo won't, but once you go a step up or two (still nowhere near the high-end pro stuff), many of them have a couple holes that you stick the cap into and it'll give you a number.
Quote:
Originally Posted by mugdecoffee
I'm pretty sure capacitor codes are standard. They're just like resistor color codes. Take the first two numbers and multiply them by the 10 to the power of the third number. Basically the third number is how many zeros to add after the first two. They're measured in pF (1000pF=1nF, 1000nF=1uF).
They're not entirely standardized, unfortunately. There are some common schemes that the large majority use, including the one you gave. But there are also some real oddballs floating around, and your only hope is to either have prior experience with the brand/design, or have a measurement tool handy.
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post #10 of 13
11/8/09 at 2:43pm
Quote:
Originally Posted by Mehve View Post
The real el-cheapo won't, but once you go a step up or two (still nowhere near the high-end pro stuff), many of them have a couple holes that you stick the cap into and it'll give you a number.
Well my el-cheapo Fluke does not measure capacitance. In fact more DMMs do not measure capacitance than do, so telling someone to use a DMM in general is not a good idea because they may not understand how to do this if their meter does not provide this function that many do not.
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post #11 of 13
11/10/09 at 1:11pm
Thread Starter 
thanks guys,

after searching for hours, i couldn't find it
but then a great light shed on me : my uni-t multimeter with capacitance meter on it .

and there i was, reading very carefully, even 10pf wasn't a problem.

i needed to measure these things cause i bought them from jeff; but luckely that i measured them cause i found other parts with the same code on it, and they had different values, very strange.
anyway i installed the right ones in the CK2III, i'm working on 3 at the same time.

thanks guys,

measuring them, why i didn't think about it sooner

greetz
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post #12 of 13
2/27/12 at 7:22am

I suspect that you have old Kemet ceramic capacitors, and think the "K" may refer to the manufacturer (Kemet). I have the guys at Kemet looking for any legacy coding scheme that may have been used in the past, and if you're interested, I can e-mail you their findings. In my experience, an example code such as "K2J" may refer to K = Kemet, 2 = 200VDC working voltage, J = +/-5% accuaracy. The value may follow on a separate line, such as "102," which means 1000 picofarads.

 

Art Harrison
aka "Capacitor"
theremin1@att.net

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post #13 of 13
2/27/12 at 8:50am


Have you ever built a Theremin?

I was interested in building one just for fun...

 

edit: never mind, I found you web page.

 

Quote:
Originally Posted by capacitor View Post

I suspect that you have old Kemet ceramic capacitors, and think the "K" may refer to the manufacturer (Kemet). I have the guys at Kemet looking for any legacy coding scheme that may have been used in the past, and if you're interested, I can e-mail you their findings. In my experience, an example code such as "K2J" may refer to K = Kemet, 2 = 200VDC working voltage, J = +/-5% accuaracy. The value may follow on a separate line, such as "102," which means 1000 picofarads.

 

Art Harrison
aka "Capacitor"
theremin1@att.net



 


Edited by Avro_Arrow - 2/27/12 at 8:52am
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