Apparatus for an environment sensor system, comprising - a transducer in the form of an ultrasonic transducer for converting electrical signals into transmission signals, - a signal generator for generating the electrical signals, - a receiving amplifier device for amplifying signals received from the transducer by means of a first amplifier (V1), which is constructed as an inverting operational amplifier, and a multiplicity of impedances (R 2i , R 3i , D12a, D12b) arranged in a plurality of parallel feedback paths (1...i) of the first amplifier (V1), wherein a current-driving operational amplifier (VR i ) is provided in one of these feedback paths (i) as a driver of a voltage divider (R 2i , R 3i ), and wherein the apparatus is configured to select a suitable total impedance from the multiplicity of impedances (R 2i , R 3i , D12a, D12b) via a plurality of switches (S Ri ... S Ri , S Da , S Db ) from the plurality of parallel feedback paths (1...i) and thus to adapt the output signal strength of the receiving amplifier device by means of the selected total impedance, wherein - electrical signals coming from the signal generator and/or the transducer are attenuated upstream of the input (P10) of the receiving amplifier device , and/or - feedback of the receiving amplifier device is influenced, characterized in that the input of the driver (VR i ) is connected to the output of the first amplifier (V1) via a switch (SR i ) and the output of the driver (VR i ) is connected to the negative input (P10) of the first amplifier (V1) constructed as an inverting operational amplifier via the voltage divider which is formed from two non-reactive resistors (R 2i , R 3i ), a feedback resistor (R 2i ) and a resistor (R 3i ) connected to earth, with the result that, when the switch (S Ri ) is closed, the relatively strong currents flowing through the feedback resistor (R 2i ), in particular at the beginning of the decay of the transducer, are provided by the driver (V Ri ). - a transducer in the form of an ultrasonic transducer for converting electrical signals into transmission signals, - a signal generator for generating the electrical signals, - a receiving amplifier device for amplifying signals received from the transducer by means of a first amplifier (V1), which is constructed as an inverting operational amplifier, and a multiplicity of impedances (R 2i , R 3i , D12a, D12b) arranged in a plurality of parallel feedback paths (1...i) of the first amplifier (V1), wherein a current-driving operational amplifier (VR i ) is provided in one of these feedback paths (i) as a driver of a voltage divider (R 2i , R 3i ), and wherein the apparatus is configured to select a suitable total impedance from the multiplicity of impedances (R 2i , R 3i , D12a, D12b) via a plurality of switches (S Ri ... S Ri , S Da , S Db ) from the plurality of parallel feedback paths (1...i) and thus to adapt the output signal strength of the receiving amplifier device by means of the selected total impedance, wherein - electrical signals coming from the signal generator and/or the transducer are attenuated upstream of the input (P10) of the receiving amplifier device , and/or - feedback of the receiving amplifier device is influenced, characterized in that the input of the driver (VR i ) is connected to the output of the first amplifier (V1) via a switch (SR i ) and the output of the driver (VR i ) is connected to the negative input (P10) of the first amplifier (V1) constructed as an inverting operational amplifier via the voltage divider which is formed from two non-reactive resistors (R 2i , R 3i ), a feedback resistor (R 2i ) and a resistor (R 3i ) connected to earth, with the result that, when the switch (S Ri ) is closed, the relatively strong currents flowing through the feedback resistor (R 2i ), in particular at the beginning of the decay of the transducer, are provided by the driver (V Ri ). <EOS>