The gain of the operational amplifier shown in the figure depends on the feedback resistor, according to the table given next to the diagram. Other operational ones can be used and R1 must be 10k-ohm, which is the input impedance of the circuit. The font does not have to be symmetrical. The circuit is from the book Robotics, Mechatronics and Artificial Intelligence by Newton C. Braga, published in the United States.
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