Instrumentation Amp

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Are the inputs of the input-stage op-amps reversed? It looks like they are configured for positive feedback instead of negative feedback. I'd guess the circuit inputs should go to the non-inverting op-amp inputs.	by nibot February 01, 2013
You are right the input op-amps are reversed. I will correct it.	by FInacio February 02, 2013
One more question: what is the purpose of OA5?	by nibot February 04, 2013
The purpose is to compensate deviations of the zero line originated by input op-amps. I decide to divide 225K resistor in one 125K fixed resistor and another 100K adjustable in order to allow refered compensation. I am starting using Circuit Lab practicing in it.	by FInacio February 04, 2013

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Instrumentation Amp PUBLIC