6 Bands Resistor
Darios Uclaray
Can anyone read the resistor that the arrow is pointing to? From what I know you can not have a gold band as a number and if I am reading it correctly it has a tolerance of 0 which does not seem right.
I'd go for example 3 in the picture above and also say 2 ohms with a 5% tolerance. The left most band I would ignore but if you have a meter lift one leg from the PCB and measure it but be sure to compensate from the probe resistance because it will be significant in the low ohms range.
I don't want to say what color band is last or first(I don't know how to determine the order of the color bands) but the two outer bands are both brown, with there being three black bands in between them, again, making a total of five color bands.
What does all this specify? Does anybody know where I can get quality resistors(that are better documented and come with written specifications) at a good deal? And if I have this problem again, can someone please supply me with links that can instruct me on how to competently decipher resistor color coding and anatomy. Thank you.
Normally the tolerance of the resistors has a slightly farther gap than the other color bands. In the case where it doesn't have the gap i'd measure it from both sides, and use the more realistic value or make a small resistor divider to determine the resistance. You'll just have to know the value of one resistor.
The following are tools to calculate the ohm value and tolerance based on resistor color codes, the total resistance of a group of resistors in parallel or in series, and the resistance of a conductor based on size and conductivity.
An electronic color code is a code that is used to specify the ratings of certain electrical components, such as the resistance in Ohms of a resistor. Electronic color codes are also used to rate capacitors, inductors, diodes, and other electronic components, but are most typically used for resistors. Only resistors are addressed by this calculator.
The color coding for resistors is an international standard that is defined in IEC 60062. The resistor color code shown in the table below involves various colors that represent significant figures, multiplier, tolerance, reliability, and temperature coefficient. Which of these the color refers to is dependent on the position of the color band on the resistor. In a typical four-band resistor, there is a spacing between the third and the fourth band to indicate how the resistor should be read (from left to right, with the lone band after the spacing being the right-most band). In the explanation below, a four-band resistor (the one specifically shown below) will be used. Other possible resistor variations will be described after.
In a typical four-band resistor, the first and second bands represent significant figures. For this example, refer to the figure above with a green, red, blue, and gold band. Using the table provided below, the green band represents the number 5, and the red band is 2.
The third, blue band, is the multiplier. Using the table, the multiplier is thus 1,000,000. This multiplier is multiplied by the significant figures determined from the previous bands, in this case 52, resulting in a value of 52,000,000 Ω, or 52 MΩ.
The fourth band is not always present, but when it is, represents tolerance. This is a percentage by which the resistor value can vary. The gold band in this example indicates a tolerance of 5%, which can be represented by the letter J. This means that the value 52 MΩ can vary by up to 5% in either direction, so the value of the resistor is 49.4 MΩ - 54.6 MΩ.
Coded components have at least three bands: two significant figure bands and a multiplier, but there are other possible variations. For example, components that are made to military specifications are typically four-band resistors that may have a fifth band that indicates the reliability of the resistor in terms of failure rate percentage per 1000 hours of service. It is also possible to have a 5th band that is the temperature coefficient, which indicates the change in resistance of the component as a function of ambient temperature in terms of ppm/K.
More commonly, there are five-band resistors that are more precise due to a third significant figure band. This shifts the position of the multiplier and tolerance band into the 4th and 5th position as compared to a typical four-band resistor.
On the most precise of resistors, a 6th band may be present. The first three bands would be the significant figure bands, the 4th the multiplier, the 5th the tolerance, and the 6th could be either reliability or temperature coefficient. There are also other possible variations, but these are some of the more common configurations.
Resistors are circuit elements that impart electrical resistance. While circuits can be highly complicated, and there are many different ways in which resistors can be arranged in a circuit, resistors in complex circuits can typically be broken down and classified as being connected in series or in parallel.
If the resistor is still OK, though faded, you could measure its value. If it has failed, then you pretty much have to find a schematic with values, or another (identical board) where the resistor is still readable.
Once you have the value, push the resistor back down so the leg makes contact with the clipped spot, then solder the leg back together. That lets your circuit keep working until you get a replacement.
Keep in mind the power rating. Under no circumstances should you use a resistor with a lower power rating. Use a higher power rating if you have room for it and can make it fit. The one you have seems to be a little on the small side (power rating wise,) so a higher rating would be a good thing.
This tool is used to decode information for color banded axial lead resistors. Select the number of bands, then their colors to determine the value and tolerance of the resistors or view all resistors DigiKey has to offer.
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Often, all the bands are closer to one end of the resistor than the other - in that case you start from the side closer to an end. Often the first band is on the slightly wider part of the resistor near the ends.
There are typically 4 to 5 bands. If the end bands are gold or silver, they are the end bands and indicate tolerance, like 1% or 10%. So start at the other end.
Black-Brown-Red Orange Yellow Green Blue Indigo Violet,, Black-Brown-ROYGBIV is how I remember them,
0 1 2 3 4 5 6 7 8 9
First 2 bands are the resistance, third is the power of ten to multiply by.
Say you had Red-Red-Red. That would be 2 2 2, or 22 x 10^2 = 2200 or 2.2K ohms.
Yellow - Blue - Yellow 4 7 x 10^4, 4 7 x 10*4, 470000 or 470K.
As I get older, I find the colors harder to see, so I check them with a multimeter most of the time now.
SMD parts I believe will just have 3 numbers printed on them, like 151, 15 * 10^1, 150 ohm.
for 5 and 6 bands resistors, it's alittle tricky if tolerance is +-5% (yellow) - Then the left side (the beginning) is the side where there is less space between the first 2 bands - Like CrossRoads, I'm getting older now and I prefer to make sure with a multimeter ....
So I am trying to make a neural network that categorizes resistor strength by recognizing the color bands. Before I get to that step I want to use OpenCV to threshold all the colors except the resistor bands so that it is easier for the neural network to categorize. However I do not know what threshold type is best suited for this.
You're on the right track and color thresholding is a great approach to segmenting the resistor. Currently, the thresholding is performing correctly, you just need to do a few simple steps to remove the background.
Right now you're using color thresholding, you could continue using this method and experiment with other ranges in the HLS, RGB, or HSV color space. In all of these cases, you can remove the background by converting in all black pixels on the mask to white. If you decide to pivot to another thresholding method, take a look at Otsu's threshold or Adaptive thresholding which automatically calculates the threshold value.
Resistors are available in many different values, shapes, and physical sizes. Practically all leaded resistors with a power rating up to one watt have a pattern of colored bands that are used to indicate resistance value, tolerance, and sometimes even the temperature coefficient. There can be anywhere from three to six colored bands on the body of a resistor, with four bands being the most common variation. The first few bands always represent digits in the value of resistance. Then you will find a multiplier band to signify moving the decimal right or left. The last bands represent tolerance and the temperature coefficient.
The first two bands always denote the first two digits of the resistance value in ohms. On a three or four-band resistor, the third band represents the multiplier. This multiplier will basically shift your decimal place around to change your value from mega ohms to milliohms and anywhere in between. The fourth color band signifies tolerance. Keep in mind that if this band is absent and you are looking at a three-band resistor, the default tolerance is 20%.
Resistors with high precision have an extra color band to indicate a third significant digit. If your resistor has five or six color bands, the third band becomes this additional digit along with bands one and two. Everything else shifts to the right, making the fourth color band the multiplier and the fifth band the tolerance. A six-band resistor is basically a five-band type with an additional ring indicating the reliability, or the temperature coefficient (ppm/K) specification. Using brown, the most common sixth band color, as an example, every temperature change of 10C changes the resistance value by 0.1%.
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