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How to Choose Accumulators Based on Their Surface Appearance

When choosing an accumulator, its surface appearance can provide some information about the type and quality of the capacitor. Here are some selection guidelines based on the surface appearance of capacitors:

  1. * * Color * : – * White capacitor * : Usually refers to ceramic capacitors made of materials such as NOP and COG. These capacitors have the advantages of low temperature coefficient, high stability, low loss, and high voltage resistance, and are commonly used in high-frequency circuits – * Yellow biased capacitor * *: This type of capacitor is widely used as a capacitor for isolation, coupling, bypass, and filtering in medium and low frequency circuits. For example, the common ceramic capacitor 104 (0.1uF) is this type of capacitor
  2. * * Appearance * : – * Smooth and flawless * : When selecting a capacitor, the outer surface should be checked for smoothness, no dents or defects, the plastic cover should be intact, the markings should be clear, the pins should not be loose, and there should be no electrolyte leakage in any part of the pins – * Shape and Size * *: There are many types of capacitors, and the shape and pin size of the accumulator should be selected according to the actual situation. For example, as a capacitor for high-frequency bypass, it is best to choose a through type capacitor, which is not only convenient for installation, but also can be used as a terminal block
  3. * * Polarity marking * *:
    -Electrolytic capacitors: The polarity lead out solder pads of electrolytic capacitors have single and double ends. The lead out solder of a single end is the positive electrode; The double ended lead wire is longer than the positive pole. When using electrolytic capacitors, they must be connected to the circuit according to the specified polarity to prevent reverse polarity from damaging the capacitor or causing accidents
  4. * * Brand and Manufacturer * : -Brand identification: Choose capacitors from well-known brands as they typically provide more reliable quality assurance and longer lifespan. – * Manufacturer Information * *: View manufacturer information, including origin, production date, etc., which can help determine the freshness and potential performance of capacitors.
  5. * * Rated parameters * : – * nominal capacity * : Ensure that the nominal capacity of the capacitor meets the circuit requirements. – * Rated working voltage * *: The rated working voltage of the accumulator must meet the circuit requirements
  6. * * Performance indicators * : – * Insulation resistance * *: Priority should be given to capacitors with high insulation resistance, low dielectric loss, and low leakage current
    -Frequency characteristics: In high-frequency applications, the frequency characteristics of the accumulator should be considered, as the capacitance and dielectric constant will decrease with increasing frequency, resulting in increased losses
  7. * * Security Certification * : – * Safety certification mark * *: Check if the capacitor has safety certification marks, such as UL, CE, etc., which indicate that the capacitor meets specific safety standards.

When selecting an accumulator, in addition to considering its surface appearance, factors such as the type, rated parameters, performance indicators, and safety certification of the capacitor should also be comprehensively considered to ensure that the accumulator can meet the requirements of circuit design and ensure stable operation of the circuit.

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