I increased the resistor value from 10K to 470K, but still the input and output waveform does not look right. The input seems to have picked up a heavy line signal of 4Vpp, and though the 470K/2.2uF seems to have filter away the 50Hz line noise, but the ouput is still too noisy with the order of 50mVpp, which over shadows the ECG signal, even existing. I vaguely remember that high value carbon resistor pick high noise. But I have no metal film resistor to do more trials and errors. So I gave up for now, and hoping to get the Olimex thing in a couple of days.
.END
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