FIELD: electronic engineering. SUBSTANCE: pump unit of first design version has first and second pumps, first and second selector switches; that of second design version has first pump and n pumps, n first and n second selector switches. Memory device of first design version has array of memory items, first and second pumps, and first and second selector switches; that of second design version has array of memory items and pump with variable number of steps. EFFECT: provision for producing output voltages of different levels at preset supply voltage across pump input. 18 cl, 2 dwg, 3 tbl
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