From: pchung705@gmail.com   
      
   Op-amp differential amplifier has much wider range of input signals comparing   
   to differential amplifier with discrete components.   
      
   Read more:   
      
   http://www.cirvirlab.com/index.php/tutorials/170-op-amp-differen   
   ial-amplifier-simulation.html   
      
   and also simulate:   
      
   http://www.cirvirlab.com/simulation/op-amp-differential-amplifier-online.php   
      
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