striped resistors. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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Recently, the rating and tolerance of small-sized fixed resistors are increasingly indicated not by an alphanumeric code, but by several colored stripes. This method of marking is often more convenient. Firstly, it is difficult to see small numbers on the body of a resistor with a power of less than 0,5 W; it is especially difficult to read the black inscription on the MLT-0.125 resistors. dyed dark green. Colored stripes are clearly visible. Secondly, the inscription can simply be erased, and the stripes applied around the entire body of the resistor will not be completely erased - some of them will still remain. And, finally, if a resistor with a "striped" marking is installed on the board, you can always find out its parameters. And resistors with an alphanumeric designation are often installed so that the inscription is at the bottom and cannot be read.

The parameters of the resistor are indicated by three, four or five bands, with the first band usually located closer to one of the terminals of the resistor, sometimes the latter is wider than the others. The first few bars mean resistance, and the last one means tolerance. If four stripes are applied to the resistor body, then the color of the first two corresponds to the first digits of the resistance. The third band indicates the factor by which the number indicated by the first two bands must be multiplied to determine the resistance of the resistor in ohms. In short, the third band indicates the number of zeros after the first two digits (unless, of course, the resistance of the resistor is less than 100 ohms). If five bands are applied to the resistor, then the first three indicate three digits, the fourth is the multiplier, and the fifth is the tolerance. When a resistor has only three bands, its tolerance is 20% and all bands mean resistance only.

Usually, reference books give frightening tables that indicate what a particular color means, depending on which strip is painted by it. In fact, everything is much simpler. The number encoded by a color bar does not depend on the number of this bar (with the exception of the last one, which indicates the tolerance). It is enough to know (remember or keep a table at hand) only the correspondence of the color to the figure, as shown in Table. 1. Correspondence of the color of the bands indicating the tolerance is shown in Table. 2.

Knowing these correspondences, it is easy to determine the parameters of the resistor. For example, a resistor has four stripes in the following order: yellow, purple, red, silver. From Table. 1 we see that the first two stripes indicate the numbers 4 and 7. Two zeros must be assigned to them, as evidenced by the color of the third strip. So, it turns out that the resistance of the resistor is 4700 ohms, i.e. 4,7 kOhm. The tolerance value (fourth band) is determined from Table. 2 - it is equal to 10%.

Another example. The resistor has orange, blue, black and gold stripes. The first two bars correspond to the numbers 3 and 6, and the third one means 0. Therefore, no zeros need to be added. Therefore, the total resistance of the resistor is 36 ohms. Tolerance - 5%.

In the event that the third band (or the fourth, when there are five of them on the resistor) is golden or silver, it is necessary to “move” the decimal point one or two positions to the left, respectively. For example, a sequence of gray, red, and gold bands indicates a resistance of 8.2 ohms.

The resistance of the resistor can be roughly determined by one penultimate digit. Consider how to do this using the example of resistors with four bands. The black third strip indicates that the resistor has a resistance of tens of ohms, brown - hundreds of ohms. red - units of kOhm, orange - tens of kOhm. yellow - hundreds of ohms. green - units of MΩ, etc. Having met a resistor whose first three stripes are red, you can immediately determine by the third digit that it has a resistance of 1 to 10 kOhm, and since the first two strips also correspond to the number 2, we conclude: resistance resistor - 2.2 kOhm.

Author: A. Shitov, Ivanovo

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