Talking about the filtering effect of film capacitor

There is a debate between the film capacitors used for filtering and the electrolytic capacitors. In fact, the application of the two films is different. The film capacitors are characterized by high analytical power, clear layers, fast speed and low noise, but the sound is slightly thin. The low frequency is poor and lacks charm. Everyone knows that the non-negative feedback line is high-frequency bright, and the low-frequency is not as good as the feedback line. At this time, the film capacitor is used for filtering. In most cases, the high-intermediate frequency will be brighter and the low-frequency will be harder, so that some people oppose the use of film capacitors for filtering. However, the speed advantage of the film capacitor is exerted. The high speed of the metal film capacitor plays a certain role in supplementing the transient intermodulation distortion, and makes the sound sound fresh and smooth. This has a good effect in practice.

The speed advantage of the film capacitor is more obvious and praised in the elimination of the switching effect of the voltage regulator circuit. Everyone has been arguing over the advantages of AC power supply, DC power supply and voltage regulation. Although there are peaks and valleys in communication, it is still continuous, and there is no switching effect. There is no switching noise. The DC power supply does not have AC power. Listening, the main performance is the performance of the sound is not smooth, which is caused by the switching noise of the voltage regulator device. In fact, the switching characteristics of the current components are very good, the switching frequency has reached MHZ level, theoretically, the audio is basically not Cause a big impact.

The electrolytic capacitor itself has noise and slow speed. It is used in the rectification and voltage stabilization circuit. The switching noise of the diode and the voltage regulator tube is superimposed. The effect can be imagined, but after changing to the film capacitor, the situation is different. The application of the filter circuit will be well verified. After using the equal-capacity film capacitor, the sense of hearing will be better than before, and there is no fluency. It is believed that the rapid charging and discharging of the film capacitor can make up for the influence of switching noise.