This circuit memorizes the input voltage that is then applied to the load in the form of a capacitor's charge. The memorization time depends on the quality of the capacitor, which should preferably be made of polyester or another with low leaks. The maximum output current is 3 A and JFET equivalent operational amplifiers 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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