Analogue pick=up follower control - has potentiometer wiper with rotation controlled to travel to new position by shortest path

摘要

The pickup is a potentiometer, and a new required potentiometer voltage (Uss) is compared with the actual voltage (Usi), and a servomotor moving the potentiometer wiper is rotated through an amplifier by the computer output, so that the difference becomes zero. When a potentiometer is a closed ring potentiometer, the movement to the new required position is performed over the shortest path by finding in addition whether this difference is greater than or equal to (180% alpha). Uo, where Uo is the voltage applied to the potentiometer, and alphao is the potentiometer useful angle. If this condition is satisfied, the wiper direction of rotation is reversed.