SparkFun
Breadboard Power Supply 5V/3.3V
Best power solution for electronics hobbyists building breadboard prototypes.
Transform any USB port into stable 5V and 3.3V power rails with this SparkFun breadboard power supply kit. Designed for easy integration, it features headers that mount directly onto a breadboard, clearly marked for power and ground connections. An integrated slide switch provides convenient power control, while a resettable fuse protects against overcurrent. This DIY kit requires basic soldering skills for assembly, making it an ideal solution for powering breadboard circuits efficiently and safely. It's a compact breakout board perfect for prototyping.
$9.95
Owner Satisfaction
4.6
/ 5
Category Rank
259
/ 775
#259 in Circuit Board Accessories
Price vs Category Average
-63%
Below average
Input Power Source
USB port
/ USB port
Who it's for
- Prototypers seeking a clean, clutter-free workspace
- Makers switching between legacy and modern sensor voltages
- Engineers requiring stable, reliable power for sensitive circuits
Who should skip it
- Budget-conscious hobbyists avoiding additional hardware purchases
- Developers powering high-draw motors or power-hungry peripherals
- Designers working on cramped, high-density breadboard layouts
Performance breakdown
Breadboard Integration
Designed specifically for seamless mounting onto standard solderless breadboards.
Assembly Complexity
Requires basic soldering skills, making it a rewarding project for beginners.
Power Stability
Reliable dual-rail output ensures consistent voltage for sensitive prototyping components.
Safety Features
Integrated resettable fuse provides essential protection against accidental short circuits.
Portability
Compact form factor fits easily into any portable electronics toolkit.
Versatility
Dual 5V and 3.3V rails accommodate most common hobbyist microcontroller projects.
Key Specs
Input Power Source
USB port
Output Voltages
5V and 3.3V
Current Limit
500mA (via PTC Resettable Fuse)
Voltage Regulator
TO-220 (LM317, 1.5A max current)
Dimensions
1.25" x 1.25"
Compatibility Standard
USB v2.0
Packaging Type
Bag of parts kit
Form Factor
Breakout Board
Features
- Provides regulated 5V and 3.3V outputs
- Powers directly from a USB port
- Includes fuse protection for safety
- Headers mount directly onto breadboards
- Convenient On/Off slide switch
- DIY kit for hands-on assembly
- Compact breakout board design
What customers say
This power supply is highly valued for its convenience and simplicity, streamlining prototyping work by replacing bulky bench supplies. Its dual 5V and 3.3V output is a key strength, enabling simultaneous powering of microcontrollers and sensors without extra regulators. Users consistently praise the stable voltage regulation, which is vital for sensitive digital circuits. Input flexibility via barrel jack or USB is also appreciated. The main constructive feedback concerns current limitations; while perfect for low power needs, advanced users sometimes desire higher 5V current for components like servos. Overall, its robust build and excellent documentation ensure high satisfaction.
Know before you buy
No, this is a DIY kit. You will need basic soldering skills to assemble the components onto the board before it can be used.
Yes, the board is designed to provide both 5V and 3.3V power rails simultaneously, making it easy to power mixed-voltage circuits on your breadboard.
The board includes a 500mA PTC resettable fuse. If an overcurrent event occurs, the fuse will trip to protect your components and will automatically reset once the fault is cleared.
Yes, the headers are spaced to mount directly onto standard solderless breadboards, providing a stable power connection for your prototypes.
The integrated PTC fuse limits the total current draw to 500mA. While the onboard regulator is capable of higher currents, the fuse is the limiting factor for safe operation.
Still have a question?
Ask Hayley anything about this product before you decide.