An apparatus for charging a remote feedable circuit bioelectronic implanted in a patient or in a laboratory animal, said apparatus comprising: a) a composable container configured to define a closed environment suitable to receive a patient or a laboratory animal, said container comprising at least one first winding (20, 21, 22) whose axis is arranged in a first direction and at least one second winding (30, 31, 32, 33) whose axis is arranged in a second direction perpendicular to said first direction, said windings being configured so as to radiate an electromagnetic field, when supplied with alternating current, towards the inside of said closed environment along said first direction and said second direction; b) a system for powering and driving the windings of the composable container, said system comprising a switching power driver (61, 62, 63, 64, 65, 66, 67) for each winding (20, 21, 22, 30, 31, 32, 33) and a programmable logic circuit, said programmable logic circuit being configured to perform a phase comparison, the programmable logic circuit being in turn connected to a microprocessor of the powering and driving system, said microprocessor being configured to provide driving signals to the windings (20, 21, 22, 30, 31, 32, 33) for generating inside the container a rotating magnetic field, characterized in that the container comprises a plurality of composable walls made of a nonmagnetic material, said walls forming said closed environment, said windings being installed in or on the walls and configured so as to be not accessible to the patient and/or laboratory animal confined in the container and to have electrical terminals accessible only from the outside of the container when it is mounted, and in that the powering and driving system further comprises a plurality of phase locked loop circuits (71, 72, 73, 74, 75, 76, 77) respectively connected to each switching power driver (61, 62, 63, 64, 65, 66, 67) and to the programmable logic circuit of the powering and driving system. a) a composable container configured to define a closed environment suitable to receive a patient or a laboratory animal, said container comprising at least one first winding (20, 21, 22) whose axis is arranged in a first direction and at least one second winding (30, 31, 32, 33) whose axis is arranged in a second direction perpendicular to said first direction, said windings being configured so as to radiate an electromagnetic field, when supplied with alternating current, towards the inside of said closed environment along said first direction and said second direction; b) a system for powering and driving the windings of the composable container, said system comprising a switching power driver (61, 62, 63, 64, 65, 66, 67) for each winding (20, 21, 22, 30, 31, 32, 33) and a programmable logic circuit, said programmable logic circuit being configured to perform a phase comparison, the programmable logic circuit being in turn connected to a microprocessor of the powering and driving system, said microprocessor being configured to provide driving signals to the windings (20, 21, 22, 30, 31, 32, 33) for generating inside the container a rotating magnetic field, characterized in that the container comprises a plurality of composable walls made of a nonmagnetic material, said walls forming said closed environment, said windings being installed in or on the walls and configured so as to be not accessible to the patient and/or laboratory animal confined in the container and to have electrical terminals accessible only from the outside of the container when it is mounted, and in that the powering and driving system further comprises a plurality of phase locked loop circuits (71, 72, 73, 74, 75, 76, 77) respectively connected to each switching power driver (61, 62, 63, 64, 65, 66, 67) and to the programmable logic circuit of the powering and driving system.