Figure 15, Circuit of a gyrator and its resonating capacitor C2. A terminal connection point on the left goes to one end of C2. The other end of C2 goes through C1 to the noninverting input of an op amp. A resistor, R1, connects from the noninverting input to ground. Another resistor, R2, connects from the output of the op amp to the junction of C1 and C2. The output is also connected to the inverting input of the same amplifier. C1, R1, R2, and the op amp behave electrically as an inductor that has one end grounded. C2 is the capacitor which tunes the inductor to resonance.
End of verbal description.
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