PICkit3 external dual power supply (3v3-5V) circuit

Giorgos from PCBheaven wrote a post detailing the build of his PICKIT 3 external dual power supply:

First of all, why… Why use such a circuit since the PICkit 3 has a built-in power supply software controlled. There are basically two reasons to build this circuit: First of all, it may happen – The internal PSU may be destroyed. Actually, i fried the PICkit3 PSU myself and i know for sure that it may happen…