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 maximum current at the load depends on the MOSFET used. The memorization time also depends on the capacitor value. The circuit is from the book Robotics, Mechatronics and Artificial Intelligence by Newton C. Braga, published in the United States.
