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i only want the pulse rate, then the output is connected to speaker. i try to use electret micrpophone, but it did't work. The circuit is complicated too. i really run out of ideas right now.
I am in need of a piezo electric sensor.. my aim is to measure heart beat using it.. I tried of obtaining heart beat using the sensor obtained from buzzer, but it does'nt worked satisfactorily......so can anyone please tell me the electronic components or equipments from which I can get piezo...
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