Better to know some... than all
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RESISTOR COLOR CODES The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only. All 5-band resistors use a colored tolerance band. The blank (20%) "band" is only used with the "4-band" code (3 colored bands + a blank "band").  Example 1 A resistor colored Yellow-Violet-Orange-Gold would be 47 k  with a tolerance of +/- 5%Example 2 A resistor colored Green-Red-Gold-Silver would be 5.2 with a tolerance of +/- 10%. | |||||