Breadboard power supply modules are low priced and are made to be plugged directly into an electronics prototype breadboard. This page covers the typical properties of common modules. Your particular module may vary.
Connecting to the breadboard
The pins on the bottom of the board are arranged so that when you plug it into an upright breadboard, the red row will be connected the positive supply, while the blue row will be connected to the negative supply, which is usually called ground for DC power. Be careful though because if the breadboard (or the module) is upside down, then the red rows will have the negative voltage while the blue rows will have the positive voltage.
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Providing power to the module
The module usually gets it’s power from an AC-DC adapter that outputs about 9V from a male barrel plug. It turns that higher voltage into either 5V or 3.3V to one or both breadboard power strips. You can also set the module so that it does not deliver power to one or both power strips.
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