A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, has a valve needle which cooperates with a valve-seat surface to form a sealing seat, and an armature which is connected to the valve needle, the armature being acted upon in the closing direction by a restoring spring and cooperating with a magnetic coil. Noise from all sources is suppressed in the output signal of the transducer through a number of techniques. An incoming frame-structured time division multiplex signal carrying incoming timeslots is received from a client.