Circuit for pulse signal amplification

Probe high current needle 120 needle head diameter is 3.0 threaded needle high current needle total length is

As shown in the figure, the pulse signal amplifying circuit is designed to design a low-pass amplifier according to the calculation of the maximum number of beats of the human body pulse after exercise for 240 times/minute, which is composed of IC2A and C04, as shown in the figure. The corner frequency is determined by R07, C04, R08 and C05, and the magnification is determined by the ratio of R08 and R06.