The film capacitor
has many excellent characteristics, so it is a kind of capacitor with excellent performance. Its main equivalence are as follows: non-polarity, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss. Based on the above advantages, film capacitors are widely used in analog circuits. Especially in the signal cross-connection part, capacitors with good frequency characteristics and extremely low dielectric loss must be used to ensure that the signal will not be too distorted when it is transmitted. Among all plastic film capacitors, polypropylene (PP) capacitors and polystyrene (PS) capacitors have the most remarkable characteristics. Of course, the prices of these two types of capacitors are relatively high. However, in recent years, in order to improve the sound quality of audio equipment, the parts and materials used have become more and more advanced. Price is not the most important consideration. Therefore, in recent years, the frequency and quantity of PP capacitors and PS capacitors used in audio equipment have also increased. Higher. Readers can often see XX brand equipment, how many XX brand name PP capacitors or PS capacitors are used as an endorsement of the sound quality. This is the reason. The usual method of making film capacitors is to use metal foil such as aluminum as electrodes and plastic films to be overlapped and wound together. However, there is another manufacturing method for film capacitors, called Metallized Film. The manufacturing method is to deposit a thin layer of metal on the plastic film by vacuum evaporation to serve as the electrode. In this way, the thickness of the electrode foil can be omitted, and the volume of the capacitor per unit capacity can be reduced, so the film capacitor is easier to be made into a small and large-capacity capacitor. For example, the common MKP capacitor is the code name for Metalized Polypropylene Film Capacitor, while MKT is the code name for Metalized Polypropylene Film Capacitor.
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