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Why use CBB capacitor instead of electrolytic capacitor filtering?
Because it depends on the type of filtering, polar electrolytic capacitors are used to filter DC waves, and nonpolar CBB capacitors are used to filter AC waves. When AC waves need to be filtered, CBB capacitors should be used instead of motor capacitors. Moreover, when the circuit is a high frequency circuit, it is more necessary to use CBB capacitor. Their characteristics are as follows: \x0d\ CBB capacitance: \ x0d \ x0d \ nonpolarity, high insulation impedance, excellent frequency characteristics (wide frequency response) and low dielectric loss. Based on the above advantages, thin film capacitors are widely used in analog circuits. Especially in the part where the signals cross, capacitors with good frequency characteristics and extremely low dielectric loss must be used to ensure that the signals will not be distorted too much during transmission. High dielectric constant, small volume, large capacity and good stability, suitable for bypass capacitors. Polystyrene thin film capacitor has small dielectric loss, high insulation resistance, but large temperature coefficient, and can be used in high frequency circuits. \x0d\ electrolytic capacitor: \ x0d \ x0d \ polar electrolytic capacitor usually plays the role of power supply filtering, decoupling, signal coupling, time constant setting and DC isolation in power supply circuits or medium and low frequency circuits. Generally, it cannot be used in AC power supply circuits. When it is used as a filter capacitor in DC power supply circuit, its anode (positive pole) should be connected to the positive terminal of power supply voltage, and its cathode (negative pole) should be connected to the negative terminal of power supply voltage, so it can't be connected reversely, otherwise it will damage the capacitor. Non-polar electrolytic capacitor is often used in speaker frequency division circuit, TV S correction circuit and single-phase motor starting circuit. \x0d\ electrolytic capacitors are widely used in household appliances and various electronic products, with a large capacity range, generally 1~ 1000μF, and the rated working voltage range is 6.3~450V. Its disadvantages are large dielectric loss and capacitance error (the maximum allowable deviation is+100% and -20%), poor high temperature resistance and easy failure after long storage time.
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