Active electrodes with EMG

Hello,

I am interested in EMG and am looking to build active electrodes

I built the scheme with a http://uazu.net/eeg/ae.html TLC272 and I look for 
the right electrode size

I was inspired by this one
(EEG/EMG Using Dry Electrodes / Nick Arango ) 
http://web.mit.edu/6.101/www/s2015/projects/narango_Project_Final_Report.pdf
and then this one
(Surface EMG Multichannel Measurements Using Active, Dry Branched Electrodes 
/ Federico N. Guerrero , , Enrique Spinelli )
  https://books.google.fr/books?id=jrZnBwAAQBAJ&pg=PA1&lpg=PA1&dq=Surface+EMG+Multichannel+Measurements+Using+Active%2C+Dry+Branched+Electrodes&source=bl&ots=0DiPxTWiV9&sig=hwnVxpei8Nz6zNAYnrkr-J9t1oY&hl=fr&sa=X&ved=0ahUKEwi4ye7ZwI7MAhWKDZoKHY3FD64Q6AEIKzAC#v=onepage&q=Surface%20EMG%20Multichannel%20Measurements%20Using%20Active%2C%20Dry%20Branched%20Electrodes&f=false

But I have difficulties . It's pretty random and the resistance between the 
electrodes is several MegaOhms .
I am looking for tips and tricks.
Thank you.

I have a project to build a unit of a EMG biofeedback like Edmund Jacobson 
of neurovoltmeter measuring voltages of the order of a few microvolts .
We must eliminate the 50 Hz noise floor.
I made a Tnotch specified filter, but the noise is 5 microvolts .
In the end I would like to display the voltage on an android smartphone 
using a Bluetooth connection with an Arduino .

Paul Peyriller
Rueil (France) 


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