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)...

The present invention relates to a hearing device (1) comprising at least a signal processing unit (3) and at least a fuel cell (4) to supply the signal processing (3) unit with energy. The fuel tank of the fuel cell (4) comprises a membrane (5) or an area...