High-pitched hisses or whines are typically caused by external electromagnetic interference. If your switching power supply isn’t designed for quiet operation and it’s producing a high- or low-pitched whine or hissing, there are ways to mitigate the noise.Ĭheck where you’ve plugged in your power supply. Although all switching power supplies will produce noise, they are usually designed to create noises inaudible to the human ear. ![]() ![]() A switching power supply is a remarkably efficient type of power supply, which quickly turns off and on, used to regulate amperage and current.
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