FIELD: electrical engineering. SUBSTANCE: smoothness of control in digital device where digital code information is needed for change of any parameter is ensured by presence of a large number of contacts located on immobile disc and manufactured in the form of ring combs in the amount of three. Ridges of ring combs are so positioned relative to each other that in each fixed position of mobile disc contact of conductive element is possible only with one ridge of one of the three ring combs. Contacts of ring combs are connected to inputs of two flip-flops across which output a pulse emerges with closing of rings of ring combs. It is possible to judge on direction of rotation of control knob depending on across output of which flip-flop first pulse appeared. EFFECT: enhanced smoothness of control and adjustment. 3 dwg
