Now I have assembled a Lead II cable. I found the 10 electrode cable a bit clumsy, and there is no point to make any good quality cable with shield from line noise etc, because the CMRR of the front end op amps are very high. Also the PSU even with back end 200VAC switching do not casue trouble. The most critical thing is the 40Hz oscillation, or 50Hz actually, which I am not sure. I read that digital filters are used before doing ADC. I need to read more.
Anyway, the time has come to look at my Lead II wave.
.END
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