can we operate micro controller through ac supply?

 

Yes, just rectify and then regulate it.

p/s: Oops, did you mean 220V mains AC? Then you need to step it down first....

 

Suggestions of application notes describing a type of power supply which we are not allowed to discuss here were removed by a moderator -dc

Drop the AC with a resistor and use a bridge plus:-
Max.

 

@aishwarya1234 P.M. me if apps needed.
Max.