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An update - an Elbow 4" PVC was placed and seems to reduce noise levels by 10% - 20% (a subjective estimation). It's not a perfect solution, but pretty reasonable. Thanks.


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Posting as answer: Did you try shutting off power to your house at the main breaker? That would rule out any AC-mains connected devices. What about your toilet? The fill valve can make noises like this and it can be continuous if it's leaking.


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The best way to eliminate transformer noise is to purchase a quality transformer. The noise is because the laminated core is heavily loaded or overloaded and the plates are actually vibrating because of eddy currents. I can’t quite make out the size, but it looks like 24V, 20VA. I would bump it up to a 24V, 40VA unit that would be compatible with video ...


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First, even though the exposed wires are low-voltage, likely 16 VAC, they should be covered for esthetics (if the transformer were accessible to children, not inside a closet, it is likely required). That said, the buzzing noise is likely being transmitted to the metal plate and wall, which make it much louder. A few things to reduce the buzz: Remove the ...


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