I'm talking about the 3 boxes that form a column, near where it says 5V on the top of a lead and 3V below it. The lead comes out of the middle box.

[The datasheet for the AT90USB1286](http://ww1.microchip.com/downloads/en/DeviceDoc/doc7593.pdf) mentions nothing about this, only that there should be 22Ohm resists between D- and D+ (check) and a 1uF cap to UCAP (check).

USB1 supplies 5V (default usb power).

[![teensy schematics](https://i.stack.imgur.com/2J67J.gif)](https://i.stack.imgur.com/2J67J.gif)
[![real teensy](https://i.stack.imgur.com/XLT7E.jpg)](https://i.stack.imgur.com/XLT7E.jpg)