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Adjustable Breadboard Power Supply V2.0 can directly takes power from DC wall wart and outputs a selectable 5V or 3.3V regulated voltage.
Compare to other breadboard power supply designs, this one provided USB Type-A port like the Arduino family, you can toggle the switch and select your power source. (USB or dc jack). We also used JST-2pin power jack ,the one as on Arduino family,
With this board, you can send power to both power lane of the breadboard, and each side has a on/off switch.