Powering Entire Arduino Mega with 3V3

Using Arduino General Electronics
6

A few possibilities:

  1. unsolder the 5v regulator and put in its place a 3.3v regulator of the same form factor;
  2. the schematic suggests board space for a mc33269st but doesnt have the actual part in. in its space, solder in a 3.3v regulator and unsolder the 5v regulators output pin.
  3. if you already have a 3.3v source, jump the 5v regulator's input/output pin, and plug in the 3.3v source.

...