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.
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.
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.
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.
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.
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.
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.