1. The problem statement, all variables and given/known data http://img16.imageshack.us/img16/9341/shtoeta.jpg [Broken] Find Vout. 2. Relevant equations http://img687.imageshack.us/img687/7393/formulaspage.jpg [Broken] 3. The attempt at a solution This is the first time I see Vin connected to both the + and the -! I scanned my known op-amps list, and I can't see anyone similar. Can anyone tell me the name of that op-amp first, please?