Ryan,
Proper layout is the fix, the transformer has the straddle signal
ground and
chassis ground planes. These planes should never overlap.
Another trick I found is to stitch a 2kV/0.001micro farad SMD capacitor
across sig gnd and chassis gnd.
I don't understand why to avoid capacitance between signal gnd and chassis gnd
planes and at the same time use the capacitor between them ?
Regards
Piotr Galka
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