Micro seismic oscillation detecting device

A micro seismic oscillation detecting device is simple in structure and can be used normally without being installed on iron nails. The micro seismic oscillation detecting device comprises a casing, a cover, a display screen, a bubble level, an acceleration sensor, a circuit board, a power supply, a solid sealing filler and a lead. The circuit board comprises an amplifying circuit, a signal processing circuit, a data processing circuit and a voltage conversion circuit. The acceleration sensor is a Swiss Sf1221 type micro-electromechanical system (MEMS) acceleration sensor. The amplifying circuit is AD620 of American ANALOGDEVICE Company. The acceleration sensor is connected with a pin 2 and a pin 3 of the amplifying circuit AD620 through a lead. The signal processing circuit adopts an eight-order low pass filter MAX291 based on switch capacitor filter technology of Maxim Company. The voltage conversion circuit adopts TPS767D301.