Abstract: The present invention relates to a method to generate at least a supply voltage to supply energy to a hearing device, whereas the ratio between the supply voltage and the source voltage is adjustable. The hearing device substantially comprises a source (Q), at least a switching element (S1, . . . , Sn), at least an energy transfer element (EUE), at least an energy storing element (ES), a load (Z) and a control unit (CTRL), whereas the method consists in that, in a first step, the control unit (CTRL) acts on the switching elements (S1, . . . , Sn), such that energy is transferred from the source (Q) to the energy transfer elements (EUE), that, in a second step, the control unit (CTRL) acts on the switching elements (S1, . . . , Sn), such that at least a part of the energy stored in the energy transfer elements (EUE) is transferred to the energy storing elements (ES) to build a supply voltage across the load (Z).

Abstract: A hearing aid with a mechanical/electrical input converter and an electromechanical output transducer. The hearing aid includes a signal processing unit with an input operationally connected to the output of the input converter. The signal processing unit includes a switched output unit with a switch over control input. The signal processing unit is operationally connected to the input of the output transducer and generates an output signal switched between at least two predetermined signal levels. The signal processing unit further includes a pulse width modulator unit which generates a pulse width modulated output signal. The output of the pulse width modulator unit is operationally connected to the switch-over control input of the switched output unit. The pulse width modulator unit includes a digital control input for controlling pulse width modulation.