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Description: This was a variation of the pulse oximeter from the picotech website. http://www.picotech.com/experiments/calculating_heart_rate/ nnWe've changed the circuit to using just one LM358/1 amplifier. And used an infrared emitter and a photo diode receiver from radio shack. It is hooked up to an oscilloscope measuring at 500mVBw and M 500ms.
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