a circuit arrangement includes two adjustable amplification devices where the signal output of the first amplification device is connected to the signal input of the second amplification device . the first amplification device has a digital input for controlling its gain and the second amplification device has an input for controlling its gain . the input for gain control in the second amplification device is connected to the input for controlling the gain of the first amplification device via a means such that a change in the gain of the second amplification device in one direction is effected by a change in gain , brought about by means of the control , in the first amplification device in the opposite direction such that the total gain remains essentially the same .