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- May 15, 2020
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One of my subwoofers intermittently develops a hum which I *think* is an earth loop (if I put a 1:1 trafo between the source and the sub, the hum disappears, and the hum is at the right pitch for 50hz AC). So I can "solve" the problem.
But if I turn the sub's plate amplifier off and then on again, often the hum goes away. Almost always it will go away if I wait long enough with the sub's power off. And sometimes it doesn't develop for hours.
I understand enough about electronics to know: a) I know nothing; and b) how an earth loop arises, but I'd love to know why the issue is intermittent and particularly why the old "turn it off and on again" often works. By the bye, this happens without any new power draws (or former draws being switched off) on the circuit, so I guess I'm asking why there's a change in potential without anything causing it, from a layman's perspective.
Thank you,
S.
But if I turn the sub's plate amplifier off and then on again, often the hum goes away. Almost always it will go away if I wait long enough with the sub's power off. And sometimes it doesn't develop for hours.
I understand enough about electronics to know: a) I know nothing; and b) how an earth loop arises, but I'd love to know why the issue is intermittent and particularly why the old "turn it off and on again" often works. By the bye, this happens without any new power draws (or former draws being switched off) on the circuit, so I guess I'm asking why there's a change in potential without anything causing it, from a layman's perspective.
Thank you,
S.