[sdiy] capacitor i.d. please

Mon Dec 23 23:29:27 CET 2002

Neil is certainly correct about the digit-digit-multiplier...

but WATCH out for low pF caps.

A cap marked "10" is certainly 10pF

but cap between 100-999pf could be marked two ways.

"100" = 100pF  (actual value is marked)

or

"100" = 10pF  ( 1 - 0 - no multiplier)

if you see it marked 101 you are sure what it is... but if the
last digit is zero you cannot tell without a data sheet, or a meter.

H^)  harry

Subject: Re: [sdiy] capacitor i.d. please

>Hi,
>> ceramic disc marked: 104M
>> maroon polyester marked: 103 K
>> blue ceramic marked: 224
>Further to Paul's answer, there's more info on my resistor codes
>information page (http://www.njohnson.co.uk/resvalues.html), including
>what the letters for tolerance mean (in your case, "M" = 20%, "K" = 10%).
>For what it's worth, I usually interpret them as "digit digit
>no.of.zeroes".  In the above, that would be:
>> "10" and 4 zeroes => 100000 = 100,000pF = 100nF = 0.1uF,  20%
>> "10" and 3 zeroes => 10000  =  10,000pF =  10nF = 0.01uF, 10%
>> "22" and 4 zeroes => 220000 = 220,000pF = 220nF = 0.22uF
>Hope this helps,
>Neil
>--
>Neil Johnson :: Computer Laboratory :: University of Cambridge ::
>http://www.njohnson.co.uk          http://www.cl.cam.ac.uk/~nej22
>----  IEE Cambridge Branch: http://www.iee-cambridge.org.uk  ----