This is a simple but very useful board. It is a regulated 3.3V and 5V power supply that takes power from a standard USB host connector. This means you have a portable power supply you can plug wherever there is an USB connector available, a HUB, a laptop, etc.

The board has 3 pads: 1 for GND, 1 for 3.3V supply and 1 for 5V supply. The pads are 0.1″ (2.54mm) and can be used with standard pin headers.

There are no jumper settings or solder options to set: 3.3V and 5V are are always output as long as it’s connected to USB.

The board features a LD1117 power supply from STmicroelectronics (low noise low drop voltage regulator), a female USB MINI connector and an indicator LED.

We also ship a power supply from USB with an USB-C connector: the AK-USBSUPPLY-C board.

The board comes fully mounted and tested.


  • Output current:
    • 5V pin: up to 500mA (standard USB)
    • 3.3V pin: up to 500mA.
  • Indicator led.
  • Ease of use.
  • Small size.



Note: this board was updated on August 2022. The previous LK112M33TR power supply was replaced with a STMicroelectronics LD1117. The previous schematics can be found here.

Additional information

Weight 0.010 kg
Dimensions 25 × 11 × 10 mm



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AK-USBSUPPLY – 3.3V and 5V Power Supply From USB

Power supply board that delivers 3.3V and 5V from USB.


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