A important part of breadboarding is supplying the proper power to the circuits you are building. We prototype on solderless breadboards, then move the circuit to a solder type protoboard that matches the solderless breadboard. We do this to make our projects easier for others to duplicate. We have a favorite power supply that fits both the solderless breadboard, and the solderable protoboard. It has dual 3.3v / 5v power supplies, so each set of power rails on the breadboard is voltage selectable.
Breadboard Power Supplies
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