Schematic diagram of the detection and amplification circuit of the heart sound pulse sensor

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A sensor is a physical device or biological organ that detects and senses external signals, physical conditions (such as light, heat, humidity) or chemical components (such as smoke) and transmits the detected information to other devices or organs. In this circuit, Cs is the equivalent capacitance of the PVDF film, and Rs is the sum of the contact resistance and the wire resistance. The circuit adopts the dual op amp compensation form, which not only can reduce the input offset voltage, but also compensates for the input offset current and the temperature drift of the op amp. Therefore, it is beneficial to strengthen the long-term stability of the circuit and satisfactorily meet the detection. Claim.