3.3V and 5V Breadboard Power Supply

Dual-Voltage Output

A compact Mini Breadboard Power Supply (BB‑PS‑02) designed to deliver reliable, regulated 3.3 V and 5 V outputs for breadboarding and prototyping work. The board plugs directly into standard solderless breadboards and provides clean power for microcontrollers, sensor modules, logic circuits, and other low‑voltage electronics.

Power can be supplied through a 2.1 mm barrel jack or a mini‑USB connector, offering flexibility when working at the bench or on the go. On‑board regulators ensure stable output, while jumper headers allow independent selection of 3.3 V or 5 V for each breadboard rail.

Features

• Compact board designed to plug directly into standard solderless breadboards
• Two regulated outputs: 3.3 V and 5 V
• Independent voltage selection for each rail using jumpers
• Power input options:
  • 2.1 mm DC barrel jack (centre‑positive)
  • Mini‑USB connector
• On‑board power switch and status LED
• Lightweight, ideal for portable and educational projects

Specifications

• Model: BB‑PS‑02
• Input Voltage: 6.5–12 V DC (barrel jack) or 5 V (mini‑USB)
• Output Voltages: 3.3 V and 5 V (regulated)
• Maximum Output Current: Up to 500 mA (based on input source)
• Connectors:
  • 2.1 mm barrel jack
  • Mini‑USB input
• Breadboard Compatibility: Standard solderless breadboards
• Dimensions: Approx. 46 mm × 34 mm

Applications

• Arduino, ESP, and Raspberry Pi Pico prototyping
• Logic circuits and low‑voltage breadboard development
• Sensor and breakout module testing
• STEM education and electronics learning projects

A practical, inexpensive solution for powering breadboard circuits, well‑suited to students, hobbyists, engineers, and makers working on compact electronic projects.

===============

Easily provide power to your breadboard projects from a DC wall wart power supply (compatible with any of our breadboards). The board has dual independent outputs, allowing for 3.3v or 5v to be output on each side into the power connections of your breadboard project. Select one side of your breadboard to have 3.3v and the other side power inputs can be 5v DC. Jumpers located on the top of the board allow for the setting of the output voltages.

Input voltage to the DC In power connector can be anywhere from 6.5v DC to 15v DC and each output can provide up to 700mA (0.7A) of current.

.1" headers are mounted on the bottom of the PCB for simple insertion into breadboards with dual power supply rails. The DC power jack is a 2.1mm barrel connector and easily matches any industry-standard DC wall adapter or to our economically priced 12v 2A DC Wall Adapter (sold separately).

Power can be disconnected from the circuits through the onboard push button and illuminates the onboard LED power indicator when turned on.

The board also features a USB port, which allows connection to a PC and will supply 5v directly to the board.

The module is conveniently sized at 53mm wide by 32mm deep (2.1" x 1.2")