Resistor Colour Codes - Calculator

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A calculator for decoding colour code bands on electronic resistors

Resistance Calculator from The JavaScript Source

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.

This interactive JavaScript graphical calculator / interpretor can check your component or memory for resistor colour codes. If the resistor is small, on a blue or green base it may be hard to identify the correct colour rings, so you'll need to use a multimeter in ohms (the horse-shoe shape symbol) and measure directly. Best done when the resistor is out of the circuit!

73's for now.
Gary, VK3KHB

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