MB102 Breadboard Power Supply Module, Dual Rail 5V/3.3V Regulator Board, Mini USB + DC Jack Input, On/Off Switch, 2-Channel Output for 830/400 Tie-Point Breadboards, Arduino Compatible
The MB102 Breadboard Power Supply Module is a simple, reliable way to power your breadboard projects with clean, regulated 3.3V or 5V without messy wiring.
The MB102 Breadboard Power Supply Module is a simple, reliable way to power your breadboard projects with clean, regulated 3.3V or 5V without messy wiring. Designed to plug directly into standard MB102 / 830-point solderless breadboards, it delivers power to the left and right rails independently, letting you run 5V on one side and 3.3V on the other—perfect for mixed-voltage Arduino, ESP8266/ESP32, sensors, logic modules, and prototypes.
This module is a go-to tool for hobbyists, students, and engineers because it gives you a neat “bench supply” experience right on the breadboard: plug in power, switch ON, select the voltage per rail, and start building.
What it does (in plain terms)
- Takes power from Mini USB (5V) or a DC barrel jack
- Regulates it to stable 3.3V / 5V
- Feeds your breadboard’s power rails through the header pins
- Lets you choose 3.3V or 5V per side using jumpers
- Includes an ON/OFF switch so you can safely power-cycle your circuit
Key Features & Benefits
- 2-Channel Output (Left + Right Rails): Power two rails independently for different voltage needs
- Selectable 3.3V / 5V per Rail: Quick jumper selection without rewiring
- Two Input Options: Use Mini USB 5V for convenience, or DC barrel input for flexibility
- Breadboard-Ready Design: Drops into the breadboard power header area (MB102 layout)
- ON/OFF Switch + Power LED: Easy control and quick status at a glance
- Arduino Compatible: Ideal companion for Arduino UNO/Nano/MEGA prototypes and sensor testing
Specifications
| Item | Details |
|---|---|
| Module Type | MB102 Breadboard Power Supply |
| Output Channels | 2 rails (Left + Right) |
| Output Voltage | 3.3V or 5V selectable (per channel via jumpers) |
| Input Options | Mini USB (5V) and DC barrel jack |
| Recommended DC Jack Input | Commonly ~6.5V–12V DC (varies by regulator/board version) |
| Typical Current Capability | Up to ~700mA total (practical depends on input voltage, heat, airflow) |
| Controls | ON/OFF switch, power LED |
| Fitment | Standard MB102 / 830-point solderless breadboards |
Current note: Regulators generate heat, especially when converting from higher input voltage down to 5V/3.3V. For higher loads, use lower input voltage (where appropriate) and ensure airflow.
Pin/Interface Overview (What you’ll see on the board)
Most MB102 modules include:
- Two yellow jumper blocks (one per rail): choose 3.3V / 5V / OFF depending on board markings
- Breadboard rail output pins: plug directly into the breadboard power rails
- Mini USB port: convenient 5V input
- DC barrel jack: alternate input (common for adapters)
- ON/OFF switch: cuts output power cleanly
- Power indicator LED: shows when output is enabled
(Exact silkscreen labels can vary slightly by batch, but function is the same.)
How to Use (Quick Setup)
- Insert the module into the breadboard’s power input area (aligned to the +/– rails).
- Choose your input:
- Mini USB for 5V power (easy and common)
- DC barrel jack if you’re using an external adapter
- Set each rail voltage using the jumpers:
- Left rail: 3.3V or 5V
- Right rail: 3.3V or 5V
- Toggle the switch ON. The LED should light.
- Connect your components to the breadboard rails and start prototyping.
Best Practices / Safety Tips
- If your project draws more current (motors, servos, many LEDs), consider a stronger regulated supply.
- Using a higher DC input increases regulator heat—keep loads reasonable.
- Always power OFF before moving jumpers or rewiring critical parts of the circuit.
- For sensitive sensors, keep wiring short and avoid noisy loads on the same rail.
Common Applications
- Arduino breadboard prototyping
- ESP32/ESP8266 + sensor testing (3.3V rail)
- Logic level experiments (3.3V & 5V on separate rails)
- Quick power for modules: OLED, I2C sensors, RF modules, relays (check voltage needs)
- Education labs and STEM kits
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