By this week, after finishes up create a PCB circuit, etching the PCB board and solder the all component on the board, I try to connect the all circuit with the operational amplifier circuit to test the circuit weather it's functioning well when combined or not functioning. When I test to put the diaphragm of stethoscope on the chest, it was display the result what I want. The result was counting after 30s diaphragm on the chest with LED was blink for a one time for a one heart beat count. But, sometime shows is not more accurate because of noise surrounding. The reading become up to 140 bpm in one time and to avoid the reading high. it need to focus deeply the diaphragm near the heart and also avoid check the heart beat in noisy surrounding.
Figure 1: Result Display
The figure below shows the step how to use Electronic Stethoscope:
Figure 2: Diaphragm of the stethoscope attach to chest to check the heart beat
Figure 3: LCD Display when the system is turned ON
Figure 4: The result of heart beat count for a normal person
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