May I use a power supply of 13V@300ma instead of a 9V@850ma required by device(keyboard), without harming the device?
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No, that is not a good idea. You're applying about 144% of the Keyboard's rated voltage - seems likely to ruin something. And you'd be looking for 283% of the rated current from the power supply - seems likely to ruin that, too.
Ecnerwal
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