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I have found a way to solve the technical issues described in my previous blog  and now my brainwaves appliance controller implemented in PSoC5LP works.   To get around the noise problem I implemented the front-end amplifier using a INA121 instrumentation amplifier as I am showing in the schematic below.  I set the gain to about 25 through a 2kOhm resistor made of R4 and R5 in series.  The center node is at the common mode voltage of the two inputs.  This common vol ...