Abstract: A hearing aid which has a casing accommodating one or more second to electric signal converting transducers (11,12) and a signal path from the transducer (11,12) to a receiver which provides a sound signal at the ear of the user. The signal processing is provided in the signal path to ensure a signal amplification/attenuation according to the needs of the user. A battery (6) is accommodated in the casing and a battery lid is arranged with a first side (1) facing the surrounding and a second side (2) facing the interior of the casing whereby the battery lid is operable for replacement of the battery. The battery lid has a recess (3) for receiving at least one sound to electric signal converting transducer (11,12) and a sound transmission path is provided between the first side (1) of the battery lid and the at least one transducer (11, 12).

Abstract: A method for producing miniature amplifier and signal processing unit includes the steps of: producing arrays of individual integrated circuits on a side of a wafer, where each circuit has a number of I/O connection points; providing a number of solder connection pads at each integrated circuit for redistribution of the I/O connection points of the integrated circuit; coating the side of the wafer having the solder connection pads with a protection coating and ensuing through going apertures in the coating to provide electrical contact with the solder connection pads; applying electrical components onto the coating and gaining electrical contact with the solder connection pads through the apertures of the coating material; and singulating the individual amplifiers from the wafer and ensuring light protection of the edges and possible unprotected side of the amplifiers.

Abstract: The invention relates to a hearing aid comprising a housing; a microphone; an integrated circuit; a receiver for outputting a signal; where the integrated circuit comprises at least one semiconductor layer including the electric circuit; the at least one layer having an outer circumference; at least one through electrical connection extending from one side of the at least one layer to an opposed other side of the at least one layer; the through electrical connection being established in distance from the outer circumference of the at least one layer. The invention further relates to an integrated circuit for use in a hearing aid as described above.

Abstract: A protective element for protecting in particular an electric motor against overload currents includes in a polymer matrix, preferably ETFE, for example 40% (by volume) of a first powdered filler of a conductive material, preferably TiB2, so that, as in the case of a PTC element, the resistance increases abruptly at a switching temperature corresponding to the melting temperature of the polymer. Also added are 20% (by volume) of a second powdered filler, a phase transition material which, at a critical temperature below the switching temperature, undergoes a phase transition in which it absorbs heat of transformation. As a result, the response time (T) of the protective element is notably extended in a range of the overload current factor (F) corresponding to higher permissible motor starting currents.