A circuit assembly , comprising: - a signal source providing a first analog signal being an audio signal; - a signal processing device configured to process a second analog signal; and - an amplifier circuit being an integrated amplifier circuit, comprising at least one supply voltage terminal configured to receive a supply voltage (Vdd) for operation of the amplifier circuit, a signal strength detector and a signaling circuit, the amplifier circuit being arranged in a signal path between the signal source and the signal processing device; - wherein the signal strength detector is configured to detect a signal strength of the first analog signal; - wherein the amplifier circuit is configured to amplify the first analog signal based on the detected signal strength and to output an amplified version of the first analog signal comprised in the second analog signal; and - wherein the signaling circuit is configured to indicate an amplification setting of the amplifier circuit at the at least one supply voltage terminal by modifying a power consumption of the amplifier circuit, wherein the amplifier circuit is configured to select the amplification setting based on the detected signal strength, characterized in that - the signal processing circuit is an external entity to the integrated amplifier circuit and - the circuit assembly further comprises a load detection circuit , the load detection circuit having a detection resistor(Rext) and connected externally to the at least one supply voltage terminal of the amplifier circuit, the load detection circuit being configured to determine a consumption current (Idd) though the amplifier circuit based on a voltage drop across the detection resistor and to provide a control signal indicative of the amplification setting of the amplifier circuit to the signal processing device. - a signal source providing a first analog signal being an audio signal; - a signal processing device configured to process a second analog signal; and - an amplifier circuit being an integrated amplifier circuit, comprising at least one supply voltage terminal configured to receive a supply voltage (Vdd) for operation of the amplifier circuit, a signal strength detector and a signaling circuit, the amplifier circuit being arranged in a signal path between the signal source and the signal processing device; - wherein the signal strength detector is configured to detect a signal strength of the first analog signal; - wherein the amplifier circuit is configured to amplify the first analog signal based on the detected signal strength and to output an amplified version of the first analog signal comprised in the second analog signal; and - wherein the signaling circuit is configured to indicate an amplification setting of the amplifier circuit at the at least one supply voltage terminal by modifying a power consumption of the amplifier circuit, wherein the amplifier circuit is configured to select the amplification setting based on the detected signal strength, characterized in that - the signal processing circuit is an external entity to the integrated amplifier circuit and - the circuit assembly further comprises a load detection circuit , the load detection circuit having a detection resistor(Rext) and connected externally to the at least one supply voltage terminal of the amplifier circuit, the load detection circuit being configured to determine a consumption current (Idd) though the amplifier circuit based on a voltage drop across the detection resistor and to provide a control signal indicative of the amplification setting of the amplifier circuit to the signal processing device. <EOS>