10
edits
Changes
From Pumping Station One
→EKG Circuit Update (element14 post)
[[File:SallenKeyLP.gif|thumb|alt=SallenKeyLP.gif|text|The low pass filter diagram.]]
[[File:SallenKeyLP.gif|thumb|alt=SallenKeyLP.gif|text|The low pass filter diagram.]]
After building the filters, we'll amplify the signal and pass it into a dedicated arduino for some processing before it gets sent to the Master Controller that's sending all the data off of the sensor array.
After amplifying the signal and filtering it to remove the power line signal of 60 Hz, we may amplify the signal again and pass it into the main Arduino for some processing before it gets sent to the Master Controller that's sending all the data off of the sensor array.
[[File:EEG-EKG-Amplifier.JPG|thumb|EEG-EKG-Amplifier.JPG|text| EEG EKG Amplifier based on Open EEG Design]]
But we'll have to build the signal amplifier first. We will use a design close to the reference design from the INA114 instrumentation amplifier, design also based on the Open EEG project design. I'll post an update after my build this weekend.
But I'll have to build those sensors first. I'm currently on my third try. I made the same mistake on the first two: not reading closely enough the spec sheet on the op amps I was using. The first one didn't work at all, but the second one cutoff at the correct frequency. It also clipped all of the negative input. This time I've read the spec sheet thoroughly, and I'm feeling good about getting it working. I'll post an update after my build this weekend.
== Notes ==
== Notes ==
