Unknown Resistor

Discussion in 'General Electronics Chat' started by uriahsky, Aug 9, 2012.

  1. uriahsky

    Thread Starter Active Member

    Apr 27, 2009
    Can I get some opinions on what this color code looks like to you?
    It is from a power supply and measures 42 ohms out of circuit.
    I just can't quite tell for sure what it should be.
  2. luvv


    May 26, 2011
    yellow,violet,orange,gold 47k 5% me thinks
  3. absf

    Senior Member

    Dec 29, 2010
    If the third ring is red then 4.7K 5%
  4. WBahn


    Mar 31, 2012
    I tend to agree, but it's hard to tell. The second band (from the right, which is the start of the code since the gold band is the tolerance band, specifically it indicated 5% tolerance) does look like it is purple (violet). That's a '7' and the standard code does have to many options for the first band. More to the point, the only options are a '2' (red) and a '4' (yellow). So that first band is almost certainly yellow. The third band (the multiplier) is hard for me to make out. I would probably have to say orange as my best guess (making it a 47kΩ) resistor and could be convinced pretty easily that it is red (making it a 4.7kΩ resistor). In order for it to be a 47Ω resistor (and thus in the ball park of the 42Ω you are reading, that band would have to be black, and I definitely don't think that is the case). There is a slim chance it might be brown, making it a 470Ω resistor, but I doubt it. I don't think it has any chance of being any of the other colors.
  5. MrChips


    Oct 2, 2009
    If you showed us a photo of the circuit it came from that might help.
  6. chrissyp

    Active Member

    Aug 25, 2008
    I think it is in fact a 47Ω.It looks to me like it has been getting hot.1st ring the orange looking band is burnt yellow. 2nd ring the brown looking band is burnt violet.3rd ring is confusing the issue with its redish shade depending ont the paint pigments this could be burnt black.measuring the resistance of the component reveals it to be 42Ω.providing the resistance is being measured correctly the result is consistent with the resistance loss of a heat damaged resistor .
  7. vk6zgo

    Active Member

    Jul 21, 2012
    I agree,the likelihood of a resistor of any of the other suggested values changing to within 5% of 47 Ohms is incredibly remote.