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What is DC on the powerline?

by Nyal Mellor April 08, 2013

What is DC on the powerline?

Half wave rectification from devices within the home such as older hair dryers causes DC offset. It can also be caused by industrial devices outside the home that load the power line unevenly.

The typical observed effect is transformer buzzing and ‘growling’ due to saturation of the magnetic core. Larger transformers, often found in amplifiers, are more susceptible than smaller.

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Nyal Mellor
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