An applicator for cosmetic material such as mascara, including an applicator head for transporting and applying the cosmetic material, a handle, a stem bearing the applicator head and received in and guided by the handle so as to be longitudinally reciprocable relative thereto, and actuating mechanism carried by the handle for moving the stem longitudinally back and forth relative to the handle. The electrical system has a wiring harness which extends between components of the vehicle and includes a plurality of wires. A feedback path is provided and configured to deliver the output of the modulator to a gain control block which provides control and stability across the entire transmission bandwidth.