An apparatus for controlling discharge of commodity from a railcar hopper car having a centersill and two laterally spaced door assemblies arranged in registry with two transversely spaced discharge openings on a hopper of the car is disclosed. A memory cell is formed in a triple well structure that includes a substrate, the buried layer, and an epitaxial layer. It continues driving current through the coil at the high level until the transducer’s output reaches a magnitude characteristic of the disturbance that typically results when the actuator’s armature reaches the end of its travel.