Custom mains EI transformer supplier in US

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a problem with existing designs is the core B operating point - for mass market profit the competition is in how little Iron and Copper they can sell you to make VA specs

I have seen Im go up large factors in 5 % high line V test, even in a "universal" design that should be expected to work at 50 Hz as well as 60

an opportunity with custom design is to dial back core B operating point for less magnostriction, lamination vibration noise, lower primary circulating current
 
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