I have a project that involves using a PIC to control 3 independent
arrays of LEDs. Each array requires a voltage of 12 volts and
consumes about 70 ma of current when operating. I found the enclosed
template schematic on the internet using a UNL2803A chip to interface
a PIC cotroller to various DC loads. It seems to fulfill my
requirements for the project at hand, but I thought it would be a good
idea to run it by the gurus out there first. Any comments,
criticisms, etc. would be appreciated.

I'm having a little trouble interpreting the data sheet on some
things. Pin 10 of chip is variously labled as common, Vcc, Vdd,
depending on whether I'm looking at the datasheet or the schematic. It
evidently supplies 12v to operate the chip. In the schematic(and my
project), the same 12v would also be used to power each of the loads.
But what if one or more of the loads happened to have a different
voltage requirement? Can the chip be operated in this mode? If so,
what is the operatinal voltage range of the chip itself and what kind
of load voltage ranges will it tolerate?