EMG Sensor please help

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http://forum.allaboutcircuits.com – Hello, I have been wanting to design an EMG sensor and looked up a of designs online and found this to be the best one out of them. However I can't find any information about it. I wanted to know if anyone had seen this before, or know of a similar design that is simple to design and cost effective. http://letsmakerobots.com/taxonomy/term/9499 (Embedded)