Photorepad pulse tester ----- Pulse Tester

As shown in the figure, it is a photolumn pulse tester circuit. The entire device consists of a heart rate sensor, a signal amplification, a single hidden pulse, a certain number, a light-column drive, a display, and a part of the power supply. IC1 is a heart rate sensor ZZ-9953, which has a small size, high sensitivity, and small power consumption. It can directly pick heart rate signal from the body's wrist, heart mouth, etc., its operating voltage is 2.5V ~ 3.5V between. F1 to f6 is 6 inverters in one 6 non-door integrated circuit CD4069, wherein F1 to F4 is used to enlarge, F5, and F6 constitute a single stable circuit. After the weak pulse signal picked up by IC1 is amplified by the high gain amplifier composed of F1 to F3, the VD1 is rectified by F3, so that the non-door F4 input end is low, the output is high, the trigger is triggered by F5, F6, C4, The directional triggering of the differential single organism circuit is composed of R6. Its delay time is about 0.3 s. Single stabilization circuit makes the pulse signal becomes equal width, the alveter, thereby eliminating the influence of irregular pulse on the measurement result (frequency), the width of the F6 output is constant, the amplitude constant pulse sequence is from R7 ~ R9, C5, C6 smooth filter After obtaining DC voltage average, obviously, the faster pulse, the higher the voltage value.

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