Figure 6.3. The upper input terminal connects through a resistor labeled R3, to the noninverting input of an op amp. The lower input terminal is grounded. The output of the op amp connects through a resistor labeled R2, to the inverting input. The inverting input also goes through a resistor labeled R1 to ground. The output of the op amp goes to the upper output terminal. The lower output terminal is grounded. End verbal description.
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