From: pchung705@gmail.com   
      
   Op-amp instrumentation amplifier is initial input stage of EKG and EEG   
   instruments due to it's high impedance, very high common-mode rejection ratio,   
   and very high voltage gain. Read more:   
   http://www.cirvirlab.com/index.php/tutorials/162-op-amp-instrume   
   tation-amplifier.html   
   and simulate online:   
   http://www.cirvirlab.com/simulation/op-amp-instrumentation-amplifier-online.php   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)