There are just some things that shouldn't be done IMHO. The idea of avoiding the learning of a few color-number ties by using your iPhone to call them up may be a step over the edge. Carrying a resistor color code card around with you or learning some mnemonic sentence that will recall the relationship to you is a time-honored tradition. They are both just steps until you quickly learn the values you need to proceed on your building or repairing of electronic devices or projects.
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