MB102 Breadboard Power Supply Module 3.3V 5V

The MB102 breadboard power module is one of those simple tools that makes prototyping significantly more pleasant. It plugs directly onto a standard MB102 breadboard and provides clean 3.3V and 5V power rails — no more messy jumper wires from your Arduino's power pins.

Each power rail can be independently set to 3.3V or 5V via jumpers, which is perfect for mixed-voltage projects. Running an ESP32 (3.3V) alongside an HC-SR04 sensor (5V) on the same breadboard becomes trivial.

Power input options include a barrel jack (6.5-12V) or USB. The USB option is particularly convenient — just plug in any phone charger. The AMS1117 voltage regulators are adequate for low to moderate current draws.

The 700mA per rail limit is the main constraint. Servos, motors, and power-hungry WiFi modules can exceed this. For those loads, you'll still need a beefier external supply. But for sensor circuits, displays, and logic-level components, 700mA is plenty.

Build quality is basic but functional. The power LED and on/off switch are nice touches for the price.