Figure 7.7. On the left the lower input terminal is grounded. The upper input terminal goes to one end of a capacitor labeled only as C. The other end of this capacitor goes through another capacitor also labeled C to the noninverting input of the op amp. The junction of the two capacitors goes through a resistor labeled 2R , not R2, to the output of the op amp. A resistor labeled R goes from the noninverting input to ground. The output is connected to the inverting input. The output of the op amp goes to the upper output terminal of the circuit. The lower output terminal is grounded. End verbal description.
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