Capacitor Bulging in Linear Adapters

　　Capacitor bulging is a common problem in linear adapters, which can have a significant impact on the adapter's performance. When a capacitor in a linear adapter bulges, it usually indicates that the capacitor has failed internally.

　　The main reason for capacitor bulging is overheating or over - voltage. Overheating can occur due to long - term operation of the adapter under high - load conditions or poor heat dissipation inside the adapter. When the capacitor is overheated, the electrolyte inside it will vaporize, increasing the internal pressure and causing the capacitor to bulge. Over - voltage situations, such as sudden voltage surges in the power grid or problems in the adapter's voltage regulation circuit, can also damage the capacitor and lead to bulging.

　　Once a bulging capacitor is found, it must be replaced immediately. Before replacement, make sure to discharge the capacitor completely to avoid electric shock. Use a soldering iron and desoldering wick to carefully remove the bulging capacitor from the circuit board. When selecting a replacement capacitor, ensure that its capacitance value, rated voltage, and physical size match the original capacitor. After soldering the new capacitor, it is necessary to conduct a functional test of the linear adapter. Measure the output voltage stability of the adapter and check whether the ripple voltage meets the requirements. If the capacitor bulging problem is not addressed in a timely manner, it may lead to more serious problems, such as damage to other components in the adapter, unstable output voltage, or even complete failure of the adapter to work.

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