電路中電容的種類有很多種，其中最主要的就是起到電源濾波的作用，電容通電后一般都會有一點發熱的現象，但如果溫度很高的話就要立馬檢查電容或者電路板周邊的電路了。

　　There are many kinds of capacitors in the circuit, the most important of which is to play the role of power filter. After the capacitor is electrified, there will be a little heat phenomenon, but if the temperature is very high, you should immediately check the capacitor or circuit board around the circuit.

　　大部分功放在放送音樂時動態大，導致電流大小變化相差很大，電源變壓器的電流輸出能力不強，就導致電容器在大動態的時候要不斷地進行充放電，而當電容器的體積較小或者內阻較大時，就會因為充放電速度跟不上，然后電容器上的鋁電解就長時間處在工作負載狀態，就很容易使電容器的溫度上升了。

　　Most power amplifiers have large dynamic when playing music, which leads to great difference in current size. The current output capacity of power transformer is not strong, which leads to continuous charging and discharging of capacitor in large dynamic state. When the volume of capacitor is small or internal resistance is large, the charging and discharging speed will not keep up with it, and then the aluminum electrolysis on the capacitor will be in negative working condition for a long time Load state, it is easy to make the capacitor temperature rise.

　　在功放通電后電容發熱情況比較嚴重的話，首先應排除是否因電容品質存在問題，耐壓是否足夠等等，如果是原電路中使用的電容出現了問題，電解電容廠家告訴您可以通過下面這些方法進行排除。

　　If the capacitor heating is serious after the power amplifier is powered on, first of all, you should exclude whether there is a problem with the quality of the capacitor and whether the withstand voltage is sufficient. If there is a problem with the capacitor used in the original circuit, the electrolytic capacitor manufacturer tells you that you can remove it by the following methods.

　　第一種情況電容是否長時間工作在高溫環境，造成內部壓力過大，電解液干枯，已經接近失效狀態，這種情況可以將電容拆下后進行容量測試。

　　In the first case, whether the capacitor has been working in a high temperature environment for a long time, resulting in excessive internal pressure and electrolyte drying up, which is close to the failure state. In this case, the capacitance can be removed for capacity test.

　　第二種情況考慮是否是整流電路中的二極管存在問題，造成整流后的波動出現畸變，建議使用示波器觀察輸出波形是否正常。

　　In the second case, it is considered whether the diode in the rectifier circuit has a problem, resulting in the wave distortion after rectification. It is recommended to use an oscilloscope to observe whether the output waveform is normal.

　　第三種情況要考慮負載部分電路是否存在問題，負載功耗增大或者存在類似短路狀態，會引起電容溫度升高。

　　In the third case, we should consider whether there are problems in the load circuit. The increase of load power consumption or the existence of similar short circuit state will cause the temperature rise of capacitor.

　　其中開關電源對輸出端濾波電容器要求特別高，使用的都是低內阻的高速電解電容器，這也就說明我們再平時使用電容器的時候，為保證電路板能正常運作都購買那種低內阻的高速電解，另外呢要挑選相同容量的電解電容器體積稍大的。

　　Among them, the switching power supply requires high-speed electrolytic capacitors with low internal resistance at the output end, which means that when we use capacitors at ordinary times, in order to ensure the normal operation of the circuit board, we buy the high-speed electrolysis with low internal resistance. In addition, we should choose the electrolytic capacitor with the same capacity with a slightly larger volume.