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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: Transformer hum, why is that?

There is probably DC on the power line. This saturates toroidal transformers at relatively low voltages and causes mechanical hum. IE transformers and many switching power supplies are less susceptible to the problem. Some manufacturers pot transformers to prevent humming and a number of power line filters offer DC protection.


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