When I plugged in a 250VA load to the left transformer. I can smell something burning and the case is super hot.
What causes the burning smell? What part of transformer can produce burning smell?
And does it mean the transformer is already ruined? If one would continue using it.. maybe it can fail suddenly or does the burning not produce permanent damage?
Both are rated 500VA.. but I think the small one that has smell is not a real 500VA capacity transformer. It is inside a voltage regulator. Maybe a voltage regulator especially boost buck type doesn't need a full capacity transformer because it's only adding or subtracting some voltage?