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| |said by public:Of course I agree with you ... but popular "eye-control" science projects using that basic design somehow work with buzzing lights, wifi hotspots and cell phones in high school gyms.
Well working means working not just in a shielded room.
Anyway, in this thread and a previous ECG/EEG thread, I mentioned there are integrated circuit front-ends for ExG signal pickup from companies like Analog Devices. They take care of component matching and provide very good CMRR.
said by public:I commented on actual EOG amplitude/frequency earlier and mentioned that it is quite different than ECG. Here are two charts which provide characteristics of various bio signals and the main considerations for amplifier design.
Bio signals are typically uV range, in common mode noise of several V. So max cmrr is essential.
You will see that EOG is actually quite robust requiring mainly good DC response, reasonably low drift and of course very high gain. CMRR and noise (even 50/60Hz) is less of a concern with EOG than other bio signals.
However, I agree that you could come up with a much better (discrete) front-end circuit for EOG than the two examples posted so far in this thread. My suggestion is to search for an IC that does the job.