Qing Quan electronic electrolytic capacitors electrolytic capacitor positive and negative

Qing Quan electronic capacitors for everyone to talk about the role of the three - filter theory (assuming the capacitor is pure capacitive) said greater the capacitance, the smaller the impedance, the higher frequency through. But in fact most of the more than 1μF electrolytic capacitor capacitance, inductance great ingredients, so instead after high frequency impedance will increase. Sometimes you see a larger capacitance electrolytic capacitors in parallel with a small capacitance, then a large capacitor through the low-frequency, low capacitance through a high frequency. The role of the low-pass capacitor is high-impedance, low-pass frequency choke. Capacitance greater the more difficult by the low frequency. Specifically for use in filtering, large capacitor (1000μF) filter low-frequency, low capacitance (20pF) filter frequencies. Users had the image of the filter capacitor as a "pond." Since the voltage across the capacitor is not mutated, it can be seen, the higher the frequency the greater the attenuation can be very image of that capacitor like reservoirs, not by the addition of a few drops of water or evaporation caused by changes in water. It changes the voltage into current changes, the higher the frequency, the greater the peak current, so the voltage buffer. Filtering is the charging and discharging process. Qing Quan Electronics - aluminum electrolytic capacitor R & D and production experts! Capacitance of the application of electronic circuits, only in the capacitor charging process, current flows through only after the end of the charging process, the capacitor can not pass DC, acts as a "DC blocking" role in the circuit. Circuits, capacitors are often used as coupling, bypass, filtering, etc., are using it, "through exchanges, DC blocking" features. Small-capacity capacitor, typically used in high-frequency circuits, such as radios, transmitters and oscillators. Large-capacity capacitor is often used for filtering and storage charges. But also a feature, usually more than 1μF capacitors are electrolytic capacitors, aluminum electrolytic capacitors there, filled with electrolyte, and leads to two electrodes, as a positive (+) and negative (-) terminals, and other capacitors different They polarity in the circuit can not be wrong, and the other capacitors are not polar.