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What is an operational amplifier circuit?
How does an op-amp amplify a signal?
An op-amp amplifies a signal by taking the difference between the input voltage at the inverting (-) and non-inverting (+) terminals and multiplying it by a large gain. The output voltage is then equal to this difference multiplied by the gain. The high gain of the amplifier allows even small differences in input voltages to be amplified to much larger output voltages.