Portable and visual Bluetooth electronic stethoscope capable of separating heart and lung sounds

The invention relates to a portable and visual Bluetooth electronic stethoscope capable of separating heart and lung sounds. The traditional stethoscope is difficult to capture some weak and very important biological sounds made by the internal organs of a human body. A heart and lung sound sensor and the input end of an active filter circuit in the portable and visual Bluetooth electronic stethoscope are connected through signals, the output end of the active filter circuit is connected with the input end of a filter interface circuit through signals, the output end of the filter interface circuit is respectively connected with an audio power amplifying circuit and a level switching circuit through signals, the audio power amplifying circuit is connected with earphones through signals, the level switching circuit is connected with a master control unit circuit through signals, and a power circuit provides power for the active filter circuit, the filter interface circuit, the audio power amplifying circuit, t