A method for controlling a supply current for a circuit comprises setting a target value of a quantity related to a supply current, said target value being different from a presently established value of the quantity, and adjusting the quantity until a value of the quantity corresponds to the target value. An information processing apparatus includes a processor. Via connections are provided in trenches that go through the whole thickness of the wafer. A method of preparing an imaged member is also disclosed, preferably from an imaging member which comprises a lithographic printing plate precursor comprising a substrate and a metal imaging layer.