Electronics Forums > Capacitor notation

# Capacitor notation

Peter Hucker
Guest
Posts: n/a

 07-16-2006, 06:49 PM
I have two capacitors lying here, with the following inscriptions:
http://www.hucker.plus.com/temp/caps.jpg

One is blue and circular and reads:

B
102K
2KV

The other is green and a rounded rectangular shape and reads:

104K100V

The blue one reads approx 1nF on my meter, the green one reads approx 100nF.

This makes sense if you take the three numbers (102 or 104) read the same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or 100000, and the units to be pF. So what does the K mean? I originally thought it was a multiplier (1000), but it seems unnecessary, unless the units without the K are in fF!

Also, what is the B on the blue one? I asssume it's not to indicate the colour ;-)

--
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And planned to do some kissing.
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Don Klipstein
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Posts: n/a

 07-16-2006, 06:56 PM
In article <op.tcso87uowabk2w@blue>, Peter Hucker wrote:
>I have two capacitors lying here, with the following inscriptions:
>http://www.hucker.plus.com/temp/caps.jpg
>
>One is blue and circular and reads:
>
>B
>102K
>2KV
>
>The other is green and a rounded rectangular shape and reads:
>
>104K100V
>
> The blue one reads approx 1nF on my meter, the green one reads approx
> 100nF.
>
> This makes sense if you take the three numbers (102 or 104) read the
> same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or
> 100000, and the units to be pF. So what does the K mean? I originally
> thought it was a multiplier (1000), but it seems unnecessary, unless the
> units without the K are in fF!

K means 10% tolerance. J means 5% tolerance.

No tolerance code usually means 20% tolerance but can be worse. For
example, ceramics with Z5U and similar dielectrics usually have tolerance
of +80/-20% at 25 degrees C and the value varies greatly with temperature
- generally decreasing as the temperature goes much away from 25 C in
either direction.

>Also, what is the B on the blue one? I asssume it's not to indicate the
>colour ;-)

That I don't know.

- Don Klipstein ((E-Mail Removed))

John Popelish
Guest
Posts: n/a

 07-16-2006, 07:04 PM
Peter Hucker wrote:
> I have two capacitors lying here, with the following inscriptions:
> http://www.hucker.plus.com/temp/caps.jpg
>
> One is blue and circular and reads:
>
> B
> 102K
> 2KV
>
> The other is green and a rounded rectangular shape and reads:
>
> 104K100V
>
> The blue one reads approx 1nF on my meter, the green one reads approx 100nF.
>
> This makes sense if you take the three numbers (102 or 104) read the same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or 100000, and the units to be pF. So what does the K mean? I originally thought it was a multiplier (1000), but it seems unnecessary, unless the units without the K are in fF!
>
> Also, what is the B on the blue one? I asssume it's not to indicate the colour ;-)
>

I could translate these for you, but you should have a crack at them
yourself, first. See:
http://www.twysted-pair.com/capidcds.htm

Eeyore
Guest
Posts: n/a

 07-16-2006, 08:09 PM

Peter Hucker wrote:

> I have two capacitors lying here, with the following inscriptions:
> http://www.hucker.plus.com/temp/caps.jpg
>
> One is blue and circular and reads:
>
> B
> 102K
> 2KV
>
> The other is green and a rounded rectangular shape and reads:
>
> 104K100V
>
> The blue one reads approx 1nF on my meter, the green one reads approx 100nF.
>
> This makes sense if you take the three numbers (102 or 104) read the same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or 100000, and the units to be pF.

That's it.

> So what does the K mean? I originally thought it was a multiplier (1000), but it seems unnecessary, unless the units without the K are in fF!

K is 10% tolerance.

> Also, what is the B on the blue one? I asssume it's not to indicate the colour ;-)

Manufacturer's mark.

Graham

HKJ
Guest
Posts: n/a

 07-16-2006, 09:39 PM
Peter Hucker wrote:
> I have two capacitors lying here, with the following inscriptions:
> http://www.hucker.plus.com/temp/caps.jpg

Use http://www.miscel.dk/MiscEl/miscelCo...peNumbers.html
and enter the codes, it can decodes most of these notations

Jamie
Guest
Posts: n/a

 07-17-2006, 03:54 AM
Peter Hucker wrote:

> I have two capacitors lying here, with the following inscriptions:
> http://www.hucker.plus.com/temp/caps.jpg
>
> One is blue and circular and reads:
>
> B
> 102K
> 2KV
>
> The other is green and a rounded rectangular shape and reads:
>
> 104K100V
>
> The blue one reads approx 1nF on my meter, the green one reads approx 100nF.
>
> This makes sense if you take the three numbers (102 or 104) read the same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or 100000, and the units to be pF. So what does the K mean? I originally thought it was a multiplier (1000), but it seems unnecessary, unless the units without the K are in fF!
>
> Also, what is the B on the blue one? I asssume it's not to indicate the colour ;-)
>

lets see, i'll take wack at it.
0.001 Uf at 10% ?
that's just a guess,. i just ordered some caps the other day, the K
was on the top of me head.

--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

Peter Hucker
Guest
Posts: n/a

 07-17-2006, 11:06 AM
On Sun, 16 Jul 2006 19:56:00 +0100, Don Klipstein <(E-Mail Removed)> wrote:

> In article <op.tcso87uowabk2w@blue>, Peter Hucker wrote:
>> I have two capacitors lying here, with the following inscriptions:
>> http://www.hucker.plus.com/temp/caps.jpg
>>
>> One is blue and circular and reads:
>>
>> B
>> 102K
>> 2KV
>>
>> The other is green and a rounded rectangular shape and reads:
>>
>> 104K100V
>>
>> The blue one reads approx 1nF on my meter, the green one reads approx
>> 100nF.
>>
>> This makes sense if you take the three numbers (102 or 104) read the
>> same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or
>> 100000, and the units to be pF. So what does the K mean? I originally
>> thought it was a multiplier (1000), but it seems unnecessary, unless the
>> units without the K are in fF!

>
> K means 10% tolerance. J means 5% tolerance.

Ah I see. Thanks.

> No tolerance code usually means 20% tolerance but can be worse. For
> example, ceramics with Z5U and similar dielectrics usually have tolerance
> of +80/-20% at 25 degrees C and the value varies greatly with temperature
> - generally decreasing as the temperature goes much away from 25 C in
> either direction.

Ouch - are those things much use?

>> Also, what is the B on the blue one? I asssume it's not to indicate the
>> colour ;-)

>
> That I don't know.
>
> - Don Klipstein ((E-Mail Removed))

--
http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com

Anybody who claims that marriage is a fifty-fifty proposition doesn't know a damned thing about women or fractions.

Peter Hucker
Guest
Posts: n/a

 07-17-2006, 11:13 AM
On Sun, 16 Jul 2006 20:04:17 +0100, John Popelish <(E-Mail Removed)> wrote:

> Peter Hucker wrote:
>> I have two capacitors lying here, with the following inscriptions:
>> http://www.hucker.plus.com/temp/caps.jpg
>>
>> One is blue and circular and reads:
>>
>> B
>> 102K
>> 2KV
>>
>> The other is green and a rounded rectangular shape and reads:
>>
>> 104K100V
>>
>> The blue one reads approx 1nF on my meter, the green one reads approx 100nF.
>>
>> This makes sense if you take the three numbers (102 or 104) read the same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or 100000, and the units to be pF. So what does the K mean? I originally thought it was a multiplier (1000), but it seems unnecessary, unless the units without the K are in fF!
>>
>> Also, what is the B on the blue one? I asssume it's not to indicate the colour ;-)
>>

> I could translate these for you, but you should have a crack at them
> yourself, first. See:
> http://www.twysted-pair.com/capidcds.htm

Christ, what a mess! Rather ambiguous when the third number COULD be a multiplier.

--
http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com

Politicians are like diapers.
They should both be changed frequently and for the same reason.

Peter Hucker
Guest
Posts: n/a

 07-17-2006, 12:46 PM
On Mon, 17 Jul 2006 04:54:20 +0100, Jamie <(E-Mail Removed) t> wrote:

> Peter Hucker wrote:
>
>> I have two capacitors lying here, with the following inscriptions:
>> http://www.hucker.plus.com/temp/caps.jpg
>>
>> One is blue and circular and reads:
>>
>> B
>> 102K
>> 2KV
>>
>> The other is green and a rounded rectangular shape and reads:
>>
>> 104K100V
>>
>> The blue one reads approx 1nF on my meter, the green one reads approx100nF.
>>
>> This makes sense if you take the three numbers (102 or 104) read the same way as resistors - 1, 0, then 2 (or 4) zeroes. I.e. 1000 or 100000, and the units to be pF. So what does the K mean? I originally thought it was a multiplier (1000), but it seems unnecessary, unless the unitswithout the K are in fF!
>>
>> Also, what is the B on the blue one? I asssume it's not to indicate the colour ;-)
>>

> lets see, i'll take wack at it.
> 0.001 Uf at 10% ?
> that's just a guess,. i just ordered some caps the other day, the K
> was on the top of me head.

I wish I knew of a place in the UK that had their components organised better on their websites. Maplin are almost impossible to use, Farnell are getting close.

--
http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com

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Phat Bytestard
Guest
Posts: n/a

 07-18-2006, 01:51 AM
On Mon, 17 Jul 2006 12:13:55 +0100, "Peter Hucker" <(E-Mail Removed)> Gave
us:

>Christ, what a mess! Rather ambiguous when the third number COULD be a multiplier.

The third digit IS ALWAYS a multiplier.

If it is expressed in 3 digit form, it is in picofarads to the order
of magnitude given in the third digit.

A nanofard part declaration is two significant digits with the lower
case "n" designation in the place where the third digit would be.

That was a greta page BTW. Nothing ambiguous at all.

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