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Straight from the wiki page. Have fun!
Green is (+) input, Orange is (-) input, Blue is output. The top DC source is connected at +VCC, the bottom DC source is connected at -VCC.
The external circuit implementation is a non-inverting op-amp (see below links for reference). Due to the two external circuits, the gain for this config is 4 V/V.
*NOTE: If the sim doesn't start, try setting +VCC=9V, and -VCC=1V, then start the sim. Once it is underway, change to +VCC=6V, and -VCC=6V
http://en.wikipedia.org/wiki/Operational_amplifier
http://www3.telus.net/chemelec/Projects/Op-Amp.jpg
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