Abstract: The modular magazine for feeding tubular containers for stacks of electronic components to a dispenser rack of a machine for the automatic insertion of such components essentially comprises at least one assembly with containment cells for respective tubular containers of the components, each cell being defined by an elongated compartment closed at least at one end by an oscillable lid element, a plurality of sensor elements, each of which is associable with a preset respective portion of the rack to indicate the depletion of components in at least one of the containers in the rack, and electronic control circuit elements driven by the sensor elements to indicate the depletion of the components in the at least one container and to actuate the opening oscillation of the oscillable lid of that cell among the assembly of cells which accommodates tubular containers which contain components of the kind of the depleted ones.