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Resistor Colour Codes - Calculator
A calculator for decoding colour code bands on electronic resistors
These lumbering giant components use colour bands or rings to indicate their value. The four bands can represent a wide range of values, from left to right, band 1 and 2 can colour code 100 different values, while band 3 colour codes the divider/multiplier in base10 (0.01, 0.1, 0, 10, 100, 1000...) and band 4 colour codes the resistor tolerance percentage +/- range.
Band 1 represents the most significant number (MSN) and band 2 least significant (LSN). In encoding small values under 10 ohms, it is possible to represent the same value in two ways. e.g. Black Red Black = 2 ohms and Red Black Gold also represents 2 ohms with the later representation the more common.
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Updated: 2015 Tue Sep.08
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