MB102 Breadboard Power Supply Module, 3.3V/5V, Dual Rail

The MB102 solves a problem every breadboard prototyper eventually runs into: needing a clean, regulated power rail directly on the breadboard itself rather than running jumper wires out to a separate bench supply or battery pack every time a circuit needs power. This module clips directly onto the power rails of a standard-size breadboard, delivering regulated power straight into the existing rail strips.

Two independently switchable output rails are provided, each selectable between 3.3V and 5V (or switched off entirely) via onboard jumpers, letting a single board power both 3.3V-logic components and 5V components simultaneously from two separate rail pairs - genuinely convenient for mixed-voltage breadboard prototyping without needing two separate supply modules. Input power can come from either a 6.5 to 12V DC source through the barrel jack, or directly from USB, giving flexibility in how the board itself gets powered depending on what's convenient on the bench.

Maximum output current is rated under 700mA per rail, enough for the overwhelming majority of breadboard-scale sensor, logic, and small-component prototyping, though not intended for powering higher-draw motors or heating elements directly. Protection circuitry includes both short-circuit protection (through current-limiting) and reverse-polarity protection, genuinely valuable safeguards against the kind of wiring mistakes that happen constantly during active prototyping and breadboard experimentation.

An onboard on/off switch and green power-indicator LED round out the practical feature set. Hobbyists and students doing active breadboard prototyping who want clean, switchable, dual-voltage power directly on the breadboard rails - without running wires out to a bench supply for every test - will find the MB102 a genuinely convenient, inexpensive addition to a prototyping toolkit.