This circuit "memorizes" the input voltage that is stored in the capacitor and is presented at the output of the operational with FET. The time for memorizing the input depends on the leakage of the capacitor, which must be made of polyester and also on the input impedance of the OA, which is in the order of thousands of megohms. The information line must be shielded so that losses do not occur. The circuit loss is of the order of 100 mV per hour.
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