Piezoelectric acoustic transducer

摘要

The invention relates to a piezoelectric acoustic transducer with a piezoelectric diaphragm (21), which is connected to the input (67) of an amplifier (37) whose output (70) leads to a telephone set. A capacitor (73) is connected in parallel with the output (70) of the amplifier (37). Furthermore, a terminal (71) of the output (70) of the amplifier (37) can be connected additionally or alternatively to the metal housing (2) of a telephone capsule (1). Through this measure, telecommunications authority requirements regarding immunity to EMC are met even in the case of piezoelectric transducers. <IMAGE>