switching transformer

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Some/much of the ringing is from the long wires to the transformer.
Copper loss: It looks like the winding area is not full. Your outside winding is two wires and you might have room for 3 wires.
Core loss: You can try increasing the turns. This will decrease the volts/turn.
 
I Will try to rewind IT.
 
I rewound transformer.
39 turn primary 3x 0,3mm diamater wire
16 turn secondary 6x 0,3mm d. wire
It still gets hot.
 
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