Recently Viewed
Breadboard Power Supply USB - 5V/3.3V
Breadboard Power Supply USB - 5V/3.3VBreadboard Power Supply USB - 5V/3.3VBreadboard Power Supply USB - 5V/3.3V
Breadboard Power Supply USB - 5V/3.3VBreadboard Power Supply USB - 5V/3.3V

Breadboard Power Supply USB - 5V/3.3V

  (3 Reviews)
Our Price:  £7.64 

Available Now:  

No stock, delayed despatch

SKU:  PPPRT-08376
Part Number:  PRT-08376
Brand:  SparkFun
Requires Soldering:  Yes
Requires Programming:  No

A very simple breadboard power supply kit that takes power from any USB port and outputs a fuse protected and regulated 3.3V. The .1" headers are mounted on the bottom of the PCB for simple insertion into a breadboard. Pins labeled 5V/GND 3.3V/GND plug directly into the power lines.

When you plug this board into a breadboard you must be aware that the unused power and ground pins will short if they are inserted into a bread board row. To avoid this problem, orient the board so that the unused power pins are left off the side of the breadboard. You can also orient the board sideways and utilize both 5V and 3.3V at the same time.

USB v2.0 specifies a max of 500mA at 5V. The on-board fuse limits the current to 500mA. Board has a handy On/Off switch.

Comes as a bag of parts kit and is easily assembled if you can follow the silkscreen indicators and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes.

Check out our Unregulated Power Supply Tutorial!

Kit Contains:

  • USB type B connector
  • TO-220 Voltage Regulator (LM317 1.5A max current)
  • PTC Resettable Fuse
  • 100uF 35V Capacitor
  • 10uF 25V Capacitor
  • 0.1uF 50V Capacitor
  • Power LED
  • SPDT Slide Switch
  • 4pcs 0.1" Header Pins
  • 330 Resistor 1/6W
  • 390 Resistor 1/6W
  • 240 Resistor 1/6W
  • Bare PCB with Silkscreen Indicators

Dimensions: 1.25x1.25"

Customers who bought this item also bought:

Customer Reviews
Average Rating (3 Reviews):  
Write a Review and share your opinions!

Good, could be even better
Tuesday, 2 January 2018  |  Tim

Easy to make up - the PCB is printed nicely.

Instructions on the web site would help exploit this board. I used it to replace AA batteries for powering LED fairy lights - I had to file it down to fit in the battery compartment, and arrange the components to take minimal space, and fit a mcro usb (phone charging) socket which needs a bit of drilling. Alternate resistor values for changing the output voltage can be found here:

A satisfying project.

Was this helpful to you?  Yes  /  No

This review has not been appraised.

Great Project
Tuesday, 2 August 2011  |  wolf359

Great project, ideal for beginners and bread-board prototyping. Very easy to construct though the single pins for the outputs were a bit tricky to solder in place in a vertical position.


2 of 2 people found this review helpful.

Works great
Friday, 28 January 2011  |  dogmatic69

Easy to build even though the only instructions are the labels on the pcb. The led is way too bright though,


2 of 2 people found this review helpful.