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/diy/ - Do It Yourself

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164725 No.164725 [Reply] [Original]

I'm trying to identify a capacitor. It's metal film, box type. Code: p1k63. The only other marking on the cap is 1B5.

It's supposedly 100n but that I think the company fucked up my order. The .0022uf cap is 2n2k63, which makes sense enough.

Can anyone help me id the cap?

>> No.164739

bump

>> No.164741

>>164725
Can you just contact them about it?

>> No.164869

>>164725 1B5
The B means its within 0.1pF of the specified value.
The 1 and 5 mean it is 1*10^5 picofarads = 100000 pf = 100nf

The other numbers and letters are just a manufacturer code. They are not important.

>> No.165028

>>164869

That would mean 1ppm accuracy. No.
Probably 0.1pF. At least neither of the markings doesn't mean 100nF.

>> No.165030

Sorry OP, cant help you. BUt I can offer moral support. I fucking hate how caps arent labeled like resistors.

I typically just keep a journal of a description of each cap and its value.

>> No.165044

>>165028 Probably 0.1pF
Isn't that exactly what I wrote?
>>164869 The B means its within 0.1pF

>>165028 At least neither of the markings doesn't mean 100nF.
The markings mean 100nF +/- 0.1pF. This isn't a guessing game. That's how you read capacitor codes.

Letter is accuracy. Last number is power. First number(s) are the integer. It gives scientific notation in units of picofarads.

>> No.165046

>>165044

0.1pF value, not tolerance.
100000pf +/- 0.1pF = 1ppm tolerance = just no.

>> No.165052

>>165046
Values are not given by letters. The letter codes are accuracy. Just google how to read capacitor codes.

>> No.165053

>>165052
My bad B means 0.1% accuracy, not 0.1pF accuracy.

>> No.165054

>>165052

No: B = 0.1pF value.
Possibly yes: p1k63 = 0.1pF 10% 63V

Also, a typical way to mark a 100n cap would be 104K, not 1K4. B as a tolerance code isn't used with 100n caps.

>> No.165056

> Probably 0.1pF

there's no cap that small. just placing 2 PCB traces next to each other gives you some 0.5 pF.

the cap would appear to be 0.1uF or 100nF, the 'p' means decimal point for uFarads.

>> No.165058

>>165056
> there's no cap that small

There are, but they aren't common.
In any case, your suggestion that p = decimal point is much more convincing than my guesses. Or that namefag's guesses.

>> No.165059
File: 45 KB, 1392x850, powerSupli-ATX6.gif [View same] [iqdb] [saucenao] [google]
165059

>>165054 a typical way to mark a 100n cap would be 104K, not 1K4

Its not seen much anymore but values are still written like that sometimes. Its a notation engineers developed to save time. 2.2K resistors are 2K2, and 100nf caps with a 0.1% accuracy are 1B5. I've found a diagram for you that uses both notations interchangeably. Letters do not indicate value. They are accuracy. There is a system for reading capacitors and that's how it works.

http://lmgtfy.com/?q=how+to+read+capacitor+codes

>> No.165309

Make a simple circuit with inversor (schimit triggered), cap, resistor and led. measure the time the led takes to blink. change cap, measure again and compare.