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Polyester film capacitor has many excellent characteristics, so it is a kind of capacitor with excellent performance. Its main equivalences 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.
　　The structure of the polyester film capacitor is the same as that of the paper capacitor, and the dielectric is polyester or polystyrene. Polyester film capacitors have high dielectric constant, small size, large capacity, and good stability. They are suitable for bypass capacitors. Polystyrene film capacitors have low dielectric loss, high insulation resistance, but large temperature coefficient, and can be used in high-frequency circuits. www.jyhjec.com
　　 Among all the 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.　
　　 Summary of characteristics of polyester film capacitors: The capacity range of the film capacitor is 3pF-0.1uF, the DC working voltage is 63-500V, suitable for high frequency and low frequency, and the leakage resistance is greater than 10000 Ω.