Electrocardio detects preamplifier

The utility model provides an electrocardio detects preamplifier, includes a host computer, the electrode input cable that leads, and the leading output cable of the signal of telecommunication of uniting as one and a feed cable, a side of host computer shell is equipped with lead electrode input socket and the leading output socket of electrocardiosignal, another side of host computer shell is equipped with supply socket, the host computer shell is inside to be equipped with a circuit board, and the circuit of this circuit board is by the upper limbs input process circuit that leads, electrocardio signal isolation amplifier circuit, the low limbs drive circuit that leads, and leading output circuit of electrocardiosignal and DC-DC keep apart power supply circuit and form the utility model discloses having extremely strong interference killing feature, realizing human incoming signal, the isolation of output signal and power is amplified, effectively suppresses the electromagnetic interference and elimination ground loop of surrounding environment, satisfies high input impedance, high rejection ratio and human safe requirement