Figure 12. Equivalent Circuit With Pot wiper almost to the left end of the pot, cut. . The input goes to the noninverting input of an op amp. The output of the op amp connects directly to the inverting input making it a unity gain buffer. The output of the op amp goes through a 1.2 k ohm resistor to the noninverting input of the second op amp. The noninverting input also goes to the lower end of a slide pot. This pot is labeled 10 k ohms but this is the equivalent of five 50 k ohm pots in parallel. The output of the second op amp goes through a 1.2 k ohm resistor to its inverting input. The inverting input also goes to the other end of the pot. The wiper is shown to be near the left end of the pot. The wiper of the pot connects through a resistor, R, a capacitor, C, and an inductor, L, to ground.
End of verbal description.
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