Abstract: A direct contact hearing aid apparatus adapted to be mounted deep within the ear canal is disclosed, including an output electromechanical transducer for converting audio output signals into mechanical movement of an output coupling element without the production of discernible sound waves to prevent acoustic feedback. The coupling element is supported for magnetic engagement with a contact element mounted on the tympanic membrane by a metal clip attached to the malleus bone to provide direct electromechanical coupling to the ossicles through the tympanic membrane. Alternatively, the contact element may be attached to the malleus bone by a clamp whose jaws are lined with bioactive ceramic. A pair of magnetic switches is provided within the hearing aid housing for mechanically switching the connections of the battery and a volume control while the hearing aid is mounted in the ear canal in response to changes in the polarity of a remote external magnetic actuator located outside of the housing.