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The above instructable says that the alpha brain waves have an ampltude of 10 -30 microvolts whereas this article that I have linked below says that the alpha brain waves have an amplitude in the range of 20-200 microvolts.This is a major difference(a factor of 10) and will make a huge difference in the gain applied in the second amplification stage.So which one is correct ?http://www.psych.westminster.edu/psybio/BN/Labs/Br...
For the first notch filter I used a 10 ohm resistor instead of 12 ohms given here in the circuit.It seemed to have filtered out 50hz signal. At least thats what prelimnary FFT on the signal seems to suggest.
Initially I had similar issues as I could not locate tant caps with 100nF and 220nF ratings but ultimately I found a vendor (here in India).http://www.industrybuying.com/capacitors-multicomp...andhttp://www.industrybuying.com/capacitors-multicomp...
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Dear Professor Hwo,Thank you for sharing this amazing project.I am a software professional and an electronics enthusiast from India. I am planning to try this out with a bunch of high school students to assist.Request you to please share additional informations that would be required to take this forward.My email id is: email@example.com and regards,Bhaskar
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