We met on friday to begin buildling the filtering circuit for the
brainwaves. This circuit has been a bottleneck in our progress because it is
behind schedule, and nothing else can be done until we have it at least
half-working! We met in Mario's lab and brought out the schematics, Mario has
many resistors and it was a pain digging to find the right one.
Mario plans on finishing it monday afternoon and handing it over to me by
the evening. On tuesday I want to run some tests on it.
We did order a new opamp chip more similar to the one they use on
instructables, where we got our schematic. This one is dual supply, so we
should be able to get the negative swing of the signal. Because we have to use the instrumental amplifier
first, which MUST be done using negative and positive voltage, we figure itd be
best to just make the second opamp be the same. Otherwise, with biasing and
all, it may be a mess.
http://www.instructables.com/id/DIY-EEG-and-ECG-Circuit/
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