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Low Earth Orbit
Lighting & Electrical
AC line loss causes hum
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<blockquote data-quote="Scott Helmke" data-source="post: 82927" data-attributes="member: 96"><p>Re: AC line loss causes hum</p><p></p><p>The followup question here is why a high neutral to ground voltage causes hum. That leads to a bit of headscratching and thinking about power supply topology. But I think what happens is that you end up with some common-mode 60Hz voltage on the power supply input. That's no problem, any decent PSU can get rid of hum. It does that by shunting it onto the ground. And if the problem comes from long skinny wires, all that crap that the PSU wanted to get rid of now has to go over a long skinny wire as well. So our system now has localized dirty ground(s).</p></blockquote><p></p>
[QUOTE="Scott Helmke, post: 82927, member: 96"] Re: AC line loss causes hum The followup question here is why a high neutral to ground voltage causes hum. That leads to a bit of headscratching and thinking about power supply topology. But I think what happens is that you end up with some common-mode 60Hz voltage on the power supply input. That's no problem, any decent PSU can get rid of hum. It does that by shunting it onto the ground. And if the problem comes from long skinny wires, all that crap that the PSU wanted to get rid of now has to go over a long skinny wire as well. So our system now has localized dirty ground(s). [/QUOTE]
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