The ET isn't Snow White and ferroresonant chargers aren't the seven dwarves.
They don't whistle while they work; instead they hum. Actually, I'd
characterize it as an obnoxious buzz, not a hum.
You can sometimes mitigate this by physically isolating the transformer from
the charger case with some kind of resilient mounting scheme.
David Roden - Akron, Ohio, USA
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