Make CASIO Keyboard Work on Power Bank

I have an old CASIO CT-636, which works with 9V adapter, OR 6 D-size batteries. It does not come with an adapter, you have to provide one, and make sure it can switch to negative-inside, positive-outside - which is the old standard of the barrel jack.I thought it would be nice to make it work with a...
By: FireSword

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