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Low Earth Orbit
Lighting & Electrical
AC line loss causes hum
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<blockquote data-quote="John Roberts" data-source="post: 82936" data-attributes="member: 126"><p>Re: AC line loss causes hum</p><p></p><p></p><p></p><p>A high Neutral to Ground voltage doesn't or shouldn't cause hum. Neutral and Hot mains cord connections inside the product are both very isolated from chassis ground or anything that could shock humans (HiPot tested for leakage with thousands of volts.) </p><p></p><p>The elevated neutral voltage suggest high current is flowing in the associated wiring. High current means more magnetic field to induce hum in nearby wiring. Using heavier gauge wires to reduce that voltage drop will not alter current of magnetic field. </p><p></p><p>This is data, but not significant wrt your hum. If a transformer can make it clean up, a well designed active balanced input should also. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 82936, member: 126"] Re: AC line loss causes hum A high Neutral to Ground voltage doesn't or shouldn't cause hum. Neutral and Hot mains cord connections inside the product are both very isolated from chassis ground or anything that could shock humans (HiPot tested for leakage with thousands of volts.) The elevated neutral voltage suggest high current is flowing in the associated wiring. High current means more magnetic field to induce hum in nearby wiring. Using heavier gauge wires to reduce that voltage drop will not alter current of magnetic field. This is data, but not significant wrt your hum. If a transformer can make it clean up, a well designed active balanced input should also. JR [/QUOTE]
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