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How To Judge The Positive And Negative Terminals OF A Capacitor?

How To Judge The Positive And Negative Terminals OF A Capacitor?

November 30 , 2023 0

Judging the positive and negative electrodes of a capacitor is a very important skill in electronic circuits. This article will cover several common methods to help you correctly determine the positive and negative terminals of a capacitor. First, we will discuss the marking and identification of capacitors, some of which may be clearly labeled with positive and negative electrodes. Second, we will explore the difference between polar and non-polar capacitors and explain how to tell them apart. In addition, we will cover clues based on appearance and size, as well as methods for testing with a multimeter. By understanding these methods and techniques, you will be able to accurately determine the positive and negative terminals of capacitors, so as to correctly install them in the electronic circuit, ensuring the normal operation of the circuit.

In-line Electrolytic Capacitors Distinguish Between Positive And Negative Electrodes

The positive and negative electrodes of the in-line electrolytic capacitor can be distinguished by the length of the pin and the color of the housing, and the pin length is positive; The short pin is negative, the gray part of the housing with a small area corresponds to a negative pin, and the other end is positive.
If there is a package, the positive electrode is usually indicated by marking "+", or the negative electrode is indicated by a painted area

Aluminum Electrolytic Capacitors Distinguish Between Positive And Negative Electrodes

SMT aluminum electrolytic capacitors can be mounted in large quantities by SMT to improve welding efficiency, but the capacity is small compared to the in-line type. From the base, the pin corresponding to the obtuse part is positive: the pin corresponding to the straight side part is negative
From the point of view of the circuit board only, the coloring part is generally negative, and the other end is positive

Tantalum Capacitor Positive And Negative Electrode Distinction

The chip capacitor % is through the bar on the surface of the shell to distinguish the positive and negative poles, one end of the bar is positive, the other end is negative from the PCB point of view, the small area is positive; Or the one with the bar is positive; Or the "+" identifier is positive. It should be noted that the surface of the giant capacitor is very similar to that of the patch diode 9, but the opposite is true

Bolt-Type Electrolytic Capacitor Q Positive And Negative Electrode Distinction

When using, be sure to distinguish between positive and negative poles, which is very dangerous. First we have to look at the white silver side of the mark, if there is a character number is negative, if there is a + sign is positive.
If it is new, we can judge according to the length of the pin, the foot length is positive, followed by the white silver edge of the symbol, there is a character number for the negative pole

Ceramic Capacitor, Ceramic Capacitor, Chip Capacitor

For porcelain, ceramic and chip capacitors are non-polar capacitors, this capacitor generally has no positive and negative poles, the capacity is generally small, often used in signal source filtering, polarity is only temporary behavior. This is a non-polar electrolytic capacitor, so there is no polarity. Therefore, the use of the installation process does not need to be positive and negative electrode identification, can be installed at will

Conclusion

The above is the common method of distinguishing between positive and negative capacitors, when using capacitors, be sure to figure out the positive and negative capacitors, if the line is reversed, it is likely to cause a fire or explosion, so be sure to pay attention