Thread: Reading capacitor values for ceramic disc ones

  1. 09-15-2003 #1
    doubleanti
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    Reading capacitor values for ceramic disc ones

    Hey, does anyone know how you'd read the capacitor values off of ceramic disc capacitors? I just bought a pack of 100 from Radioshack (shoulda looked before I leaped perhaps, these are brown and I guess that's picofarad, when I wanted microfarad, damn jerk at radioshack...). Anyways, I've been trying to find how to do this, but I sorted thru them and I have a few piles...

    "561" capacitors
    "68K CO" capacitors (dark)
    "Z5U 502 KCK" capactors (dark)
    "E 150 +-5% NPO 100V" capacitors (they read I think 0.3 pF on my pop's reader...) (dark)
    "22" capacitors
    "472" capacitors
    "KCK .01Z Z5U" capacitors (read to be 0.01 micro Farad, which is the scale I'm looking for actually, about 0.02 to 0.05 micro Farad, but they only gave me 2!... bleh!)

    Any such help? They are either a light tan or a dark reddish brown color... as indicated, if not dark, then light.

    Help? Thanks!

    Oh and PS, doing it on a breadboard might not be as handy as I thought if the input and output's aren't fastened down, or soldiered... but I shall prevail! Thanks for the help!
    hasafraggin shizigishin oppashigger...
  2. 09-15-2003 #2
    Thantos
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    http://www.pmel.org/HandBook/HBpage26.htm
    Seems correct, but I'm really tired and haven't touched color code on resistors or capacitors in over 5 years.
  3. 09-15-2003 #3
    doubleanti
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    Hm actually I came across that likewise. I figured out the formulas for the 502, 51, and 472 caps, but now I should mention there is a green tip on the 22 capacitors (dipped tantalum?). And it turns that I got the right scale! Still don't know what to do about that long name, the 22, and the 68K one.

    Searching... Thanks btw!
    hasafraggin shizigishin oppashigger...
  4. 09-15-2003 #4
    Sebastiani
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    Actually, if you go *back* to radioshack, you can find some excellent little electronics reference books written by Forrest Mimms - very handy for this sorts of thing.
    Code:
    #include <cmath>
#include <complex>
bool euler_flip(bool value)
{
    return std::pow
    (
        std::complex<float>(std::exp(1.0)), 
        std::complex<float>(0, 1) 
        * std::complex<float>(std::atan(1.0)
        *(1 << (value + 2)))
    ).real() < 0;
}
  5. 09-16-2003 #5
    RobR
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