Bidirectional sensor circuit

A bi-directional sensor circuit with inverter, comprising:

• a sensing impedance with a first terminal and a second terminal;
• a first operational amplifier for which the non-inverting input is connected to the first terminal and its inverting input is connected to the second terminal;
• a second operational amplifier with the non-inverting input connected to the second terminal and its inverting input is connected to the first terminal;
• a first diode with the cathode connected to the inverting input of the first operational amplifier and for which the anode is connected to the output of the first operational amplifier;
• a second diode with the cathode connected to the output of the first operational amplifier and to the anode of the first diode;
• a variable impedance connected to the cathode of the first diode and to the anode of the second diode;
• a fourth diode with the anode connected to the anode of the second diode and to one end of the variable impedance;
• a third diode with the cathode connected to the inverting input of the second operational amplifier and the anode to the output of the second operational amplifier and to the cathode of the fourth diode;
• a variable impedance connected to the anode of the fourth diode and the cathode of the third diode;
• wherein the input of the bidirectional sensor circuit consists of the terminals and of the sensing impedance, and the output is at the anode of the second diode connected to an operational inverter circuit, and senses a load impedance connected to the first terminal of the sensing impedance.