a device for regulating a voltage drop across a load , particularly an electromagnetic load , includes an actuator connected in series with the load , a ground and a supply voltage . a first current balancing circuit provides an actual current which corresponds to the voltage across the load . a current source establishes a desired current . a second current balancing circuit provides a signal for actuation of the actuator as a function of a comparison of the actual current with the desired current , the actuator thereby regulating the voltage across the load .