This circuit can memorize an input signal as a charge on the capacitor. The memorization time depends on the quality of the capacitor, which should preferably be of the type of polyester that has less leakage. The memorization time also depends on the capacitor value. Other operational amplifiers with FET can be used. The circuit is from the book Robotics, Mechatronics and Artificial Intelligence by Newton C. Braga, published in the United States.
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