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In Reply to: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27:
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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Follow Ups
- RE: Transformer hum, why is that? - rkeman 05:15:46 02/23/12 (1)
- What is cause DC in my AC outlet? - cktc 12:10:01 02/25/12 (0)