I have used voltage divider circuit to drop down the line voltage.I have used 56K,1K,1K,56K resistence in series.Now i am taking a ground where two 1K resister is connected to each other.Further i am using a full wave rectifier circuit.Now when i am measuring the out put voltage which is full wave rectified with respect to ground.Now when i am conecting my circuit ground to earth i get the half wave rectified wave form and it's peak value is greater then full wave rectified wave form. SO pls reply me as soon as possible.