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RESISTOR COLOURS

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  • #1

    RESISTOR COLOURS

    Hi Guys,

    Really sorry about this but I am so new to electronics.
    I put together a surf 1.2 PI and there was no response from the board at all, even though power was at the power terminals on the board.

    I re-checked all the capacitors and diodes to check if I have placed these in the right way around which appears that I have, my problem is the resistors, I know that this should be easy but I think I may have misjudged which end the tolerance band is on the 5 band ones as all the colours looked to be spaced out evenly.

    When the kit first arrived the resistors came stuck to a strip with numbers on so I might have even thought that some were others and vice versa.

    Would one of you guys please check this excel sheet and tell me if the colours I have entered are correct? I appreciate that it will take some time but I am stuck and feel like shelving this (probably easy for you guys) project until I can understand it better

    4 BAND 5 BAND
    COLOUR1 COLOUR2 COLOUR3 COLOUR4 COLOUR1 COLOUR2 COLOUR3 COLOUR4 COLOUR5
    R1 100K [1/4 WATT 1% tolerance] brown black yellow brown brown black black orange brown
    R2 3K3 [1/4 WATT 1% tolerance] orange orange red brown orange orange black brown brown
    R3 1K5 [1/4 WATT 1% tolerance] brown green red brown brown green black brown brown
    R4 100 [1/4 WATT 1% tolerance] brown black brown brown brown black black black brown
    R5 100 [1/4 WATT 1% tolerance] brown black brown brown brown black black black brown
    R6 390 [1 WATT 5% tolerance] orange white brown gold orange white black black gold
    R7 1K5 [1/4 WATT 1% tolerance] brown green red brown brown green black brown brown
    R8 1K5 [1/4 WATT 1% tolerance] brown green red brown brown green black brown brown
    R9 1M [1/4 WATT 1% tolerance] brown black green brown brown black black yeloow brown
    R11 22K [1/4 WATT 1% tolerance] red red orange brown red red black red brown
    R12 10K [1/4 WATT 1% tolerance] brown black orange brown brown black black red brown
    R13 1K5 [1/4 WATT 1% tolerance] brown green red brown brown green black brown brown
    R14 1K5 [1/4 WATT 1% tolerance] brown green red brown brown green black brown brown
    R15 220K [1/4 WATT 1% tolerance] red red yellow brown red red black orange brown
    R16 220K [1/4 WATT 1% tolerance] red red yellow brown red red black orange brown
    R17 220K [1/4 WATT 1% tolerance] red red yellow brown red red black orange brown
    R18 47K [1/4 WATT 1% tolerance] yellow violet orange brown yellow violet black red brown
    R20 22K [1/4 WATT 1% tolerance] red red orange brown red red black red brown
    R21 1K5 [1/4 WATT 1% tolerance] brown green red brown brown green black brown brown
    R22 100K [1/4 WATT 1% tolerance] brown black yellow brown brown black black orange brown
    R23 22K [1/4 WATT 1% tolerance] red red orange brown red red black red brown
    R25 15K [1/4 WATT 1% tolerance] brown green orange brown brown green black red brown
    R26 51K [1/4 WATT 1% tolerance] green brown orange brown green brown black red brown
    R28 240K [1/4 WATT 1% tolerance] red yellow yellow brown red yellow black orange brown
    R29 51K [1/4 WATT 1% tolerance] green brown orange brown green brown black red brown
    R34 33 [1/4 WATT 1% tolerance] orange orange black brown orange orange black gold brown
    R35 100K [1/4 WATT 1% tolerance] brown black yellow brown brown black black orange brown
    Thanks

    Jason
    Tags: None
  • #2
    Colors are like your avatar.
    You need to measure parts to be sure, (that your sight saw colors correctly).

    Comment

    • #3
      There's a lot of on-line resistor color code calculators.
      Here's one:
      http://www.hobby-hour.com/electronic...calculator.php

      Comment

      • #4
        rainbow main colors...

        BROWN - 0, Infra Red, unvisible
        RED - 1
        ...
        VIOLET - 7
        GREY - 8, here must be ultra-violet =)
        WHITE - 9, full spectrum

        Comment

        • #5
          Jason, the colours on resistors can be hard to read , the better way to identify them is if you can buy a simple cheap ten dollar multimeter from your local shop, also this checks the actual value and can show errors in marking and the tolerance.

          Comment

          • #6
            Hi 6666,

            The obvious answers are the ones I seem to overlook, thank you I will go and buy one and let electricity tell me what the values are

            Jason

            Comment

            • #7
              Hi Jason

              Just remember though that all resistors have a tolerance (even 1% ones) so when you read the meter, double check the colour bands to get the preferred value.

              I had my apprentice going through a big bag of mixed resistors, checking values and putting them in drawers. It was more an exercise in teaching him how to read colour codes but he ended up using the meter and we had lots of different values that we didnt have drawers for. I had to explain to him that I only wanted him to use the meter to double check values, so he had to go through them all again assigning them to their preferred values.

              Comment

              • #8
                Can I ask 1 more question please, I hope I dont come across as dumb but it is this :-

                If for example I have
                1 x 100ohm 1% resistor with 4 bands (brown, black, brown, brown)
                1 x 100ohm 1% resistor with 5 bands (brown, black, black, black, brown)

                Are these still 100ohm @ 1%, if so why the not just keep the 4 bands to keep things simple?

                Comment

                • #9
                  The 5-band system was introduced to allow for higher precision resistors. For example, in the 4-band system there is no way of representing a 105 ohm resistor. There is even a 6-band system that is sometimes used.

                  Comment

                  • #10
                    Just remember this sentence, Bad boys rape our young girls but violet gives willingly. Black brown red orange yellow green blue violet grey white. It's how we were taught, back in the before time Not a bad idea to just check the value with a meter these days.

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