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If a transistor amplifies voltage, why are op amps used instead in many circuits? What's the advantage of op amps? - Quora
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operational amplifier - Simple version of an internal op-amp circuit - Electrical Engineering Stack Exchange
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operational amplifier - What does this op amp/transistor circuit do? (revised circuit) - Electrical Engineering Stack Exchange
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operational amplifier - Constant voltage control via op amp and transistor - Electrical Engineering Stack Exchange
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A simple opamp. All transistors have minimum sizes (for MOSFETs W/L=1)... | Download Scientific Diagram
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