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E6B23

What is an operational amplifier?

Select	Answer
A	A program subroutine that calculates the gain of an RF amplifier
B	An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
C	A high-gain, direct-coupled differential amplifier whose characteristics are determined by components external to the amplifier
D	A high-gain, direct-coupled audio amplifier whose characteristics are determined by components external to the amplifier

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