Handmade, children's shoes can look at the renderings:
This is the transformer, the input resistance is 11.5 ohms, the output is double 7.5V double 15V (high current) double 20V (small current) and a small current independent 5V output. It is expected that the output of more than 100 watts is no problem.
Overall renderings:
The circuit schematic is attached below:
Power schematic 
Left and right channel
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