For sensors and circuits that need to run on less than 5V, this adapter is an easy solution to integrate it with your Phidgets system. The PSU2001 plugs into a VINT port and steps down the USB voltage as low as 1.5V DC. There's a trim pot on the board to adjust the power source to the desired level, and the source can be turned on and off by toggling the state of the digital output of the VINT port it's connected to.