MB102 Breadboard Power Supply Module 3.3V/5V

The MB102 Breadboard Power Supply Module is an essential companion for any electronics workbench, providing clean, regulated 3.3V and 5V power rails directly to a standard 400 or 830 tie-point MB102 breadboard. Simply plug it into the top of your breadboard and instantly power your prototyping circuits — no extra wiring, no soldering required.

Two fully independent output channels can each be individually configured via jumper caps to 0V, 3.3V, or 5V, giving you the flexibility to power 3.3V microcontrollers and 5V logic simultaneously on the same breadboard. The module accepts input from a standard 2.1mm DC barrel jack (6.5–12V) or via a USB Type-A port for direct powering from a PC or USB charger. A dedicated USB Type-A output port also lets you supply 5V to a connected microcontroller board such as Arduino.

An onboard power ON/OFF toggle switch lets you cut power to the circuit without unplugging the supply, while a green power indicator LED provides instant visual confirmation of active status. Reverse polarity protection and onboard voltage regulation via AMS1117 LDO chips (1117-5.0V and 1117-3.3V) keep your components safe. Two additional sets of 3.3V and 5V output header pins provide convenient access for external connections beyond the breadboard rails.