Shenzhen Jiangnan Technology Co., Ltd. is a Sino-foreign joint ventures. Knowledge of electrolytic capacitors 
 1, the nominal parameters 
 Is listed in the capacitor housing values. 
 * Electrostatic capacity of the UF. Will not say more. 
 * The operating voltage (working voltage) referred to WV, should the value of the nominal security, which means that the application circuit must not exceed this nominal voltage. 
 * Most common temperature of 85 degrees, 105 degrees. High temperature conditions (for example, Pure Class A amplifier) ??to be preferred 105 degrees nominal. Preferably a high temperature coefficient in the general case of positive help to improve the performance of other parameters. 
 2, the dissipation factor, dissipation factor (DF) 
 Sometimes the DF value of the loss angle tan. DF value is high or low temperature, capacity, voltage, frequency ... have a relationship; the same capacity, the pressure the higher the DF value is the lower. The higher the frequency DF value the higher the temperature the higher the DF value is also higher. The DF values ??are generally not marked on the capacitor or specifications introduced above. DIY selected capacitor can give priority to select the higher pressure, such as the operating voltage is 45V, the choice of 50V is not very reasonable. Although the use of 50V withstand voltage, there is nothing wrong, but the DF value considered lacking. 63V or 71V pressure will have a better performance. Of course no matter how high the price on the uneconomical. 
 3, the equivalent series resistance ESR 
 ESR, high or low, the capacity of the capacitor voltage, frequency and temperature ... are related, ESR requirements as low as possible. When the rated voltage is fixed, the capacity the greater the lower the ESR. When capacity is fixed, the choice of varieties of high rated voltage can reduce the ESR. Low-frequency, high ESR, high frequency low ESR, high temperatures cause the ESR to rise. The equivalent series resistance ESR many brands can be found from the specifications. 

 4, the leakage current 
 To see to understand, is the leakage! Aluminum electrolytic capacitor leakage, which is determined by the physical structure. Needless to say, the leakage current is of course the smaller the better. Higher capacity capacitor, the greater the leakage current; reduce the operating voltage to reduce leakage current. Higher pressure, in turn, selected varieties will help to reduce the leakage current. The combination of the above two parameters, the priority to select the high-pressure species under the same conditions is indeed a simple and feasible method; reduce the internal resistance, low leakage current, reduce losses and increase life expectancy. Really a lot of advantages, only price will be high. A statement, the electrolytic capacitors is much lower than the rated working voltage can not be effective enough to maintain the depolarization effect between the electrode with the electrolyte, will lead to the polarization of electrolytic capacitors to reduce ripple current, increasing large ESR, premature aging. But the premise of this argument is far less than the rated working voltage, comprehensive long-term practical experience, select the rated working voltage of the nominal value of 2/3 the normal operating voltage is more reasonable can be *. Amateur case estimate the leakage current of the electrolytic capacitors in general. Electrolytic capacitor of the same capacity in accordance with the rated withstand voltage charging, place some time after the detection capacitors at both ends of the degree of voltage drop. Down voltage, the less the leakage current is smaller. 

 5, the ripple current Irac 
 Ripple current for the filter circuit for the stone is a very important parameter. Ripple current Irac as high as possible. The level of the operating frequency, the higher the frequency the Irac the greater, the lower the frequency Irac the smaller. That we need to have a high ripple current at low frequencies, in order to get a good high-current discharge characteristics, so that the more solid low-frequency full flexibility, and good control and driving characteristics; actually higher at high frequencies. ripple current in the positive help tone, high frequency have a better extension and reduce rough feeling. 
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