Magnetic Flux Generator for Balanced Membrane Loudspeaker

This paper reports the development of a magnetic flux generator with an application in a hearing aid loudspeaker produced in microsystem technology (MST). The technology plans for two different designs for the magnetic flux generator utilizing a softmagnetic substrate or electroplated NiCoFe as core material are presented and the production and characterization of four different mono- and double-layer planar coil types are reported.