DIY homemade adjustable power supply and 16-key electronic piano, I hope you like it.
Two 0-14V adjustable power outputs with overcurrent protection, as well as positive and negative 12V and positive and negative 5V outputs.
Front view
Bottom view, with cooling fan
16-key electronic keyboard made of AT89S52 single-chip microcomputer, with three modes: free playing, automatic play, and follow practice mode.
Top view
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