Starting at black for zero, brown for one, red for two, orange for three, yellow for four, green for five, blue for six, violet for seven, gray for eight, and white for nine. The EIA standard color code for significant numbers start at two significant digits and go up to four significant digits in some components and semiconductors. Most color codes read from left to right with a gap on the right side and round components may have the gap on the bottom. The EIA standard color code used in electronics is simple although through the year’s colors and the color bars have remained basically the same, some of their values have changed with technology. These are some of the color codes I use when working on electronics.
Looking up the components values and properties from its color code is easier than reverse engineering from scratch. I can reverse engineer the circuit and guess at what the appropriate replacement component is and its value or I can look up the color code and select a modern replacement that will work. Older devices often have color coded components not seen in newer electronics today, and the exact component quite often is no longer available. I work on many older electronic devices capacitors and resistors can go out of tolerance with time.
They are still in use on many devices used in electronics today. The color codes we all know and love come from EIA standards, (Electronics Industries Association) and they were used on almost every device at one time or another, even vacuum tubes. When I looked up color codes here at Instructables, I was surprised to find just a few one page Instructables on component color codes. I have been reverse engineering since before the advent of solid state circuits.
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