Does one need a regulated ac/dc power adaptors to power the Pro Mini and its servos - or is an unregulated one good enough?
voltage input spec for the Pro-Mini is:
"3.35 -12 V (3.3V model) or 5 - 12 V (5V model)"
So a unregulated DC power module that maintains it's voltage between those limit will work fine for the Mini. However servos that their own voltage spec and you would have to check the datasheet for the specific ones you own, but generally +6vdc is the maximum recommended voltage for the servos.
So bottom line is that a pro-mini has an on-board voltage regulator so feeding it with an unregulated DC is OK, but servos may have problems using a unregulated DC supply.
Lefty