The present invention relates to a method of transmitting and receiving signals and a corresponding apparatus. The circuit further includes a first resistance having a first node coupled to a source of microphone bias voltage and a second node coupled to the first terminal of the microphone; and a second resistance having a first node coupled to the source of microphone bias voltage and a second node coupled to the first terminal of the component. The apparatus also includes a second monoblock that is suitable for giving the product a round section with narrow tolerances.