![]() ![]() Now you will notice that the last two resistor have an "R" in the equation. If a letter is used to represent tolerance use the chart below. You may ask"why some have three diigits and some have four?" three digits typically means that the resistor is 5% tolerance the four digit typically means the resistor is 1% tolerance. ![]() The formula is the same with the addition to a digit.ġst value-2nd value-third value-multiplier There are some resistors which have 4 digits. The formula for breaking the code down is as follows. That does not stand for a 391 ohm, 270 ohm, and so on. ![]() Looking at the image you see 4 resistors, the first being 391 the seconed 270 and the two at the bottom are the same 30R9. I will teach you how to take those letters and digits and determine the value. Unlike Through hole resisors which use colored bands to determine the value, surface mount resistor have numbers and sometimes letters. ![]()
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