烦请转ams技术专家：

Cqjhodzz: I want to talk about problems in use, please ams expert to solve: I design instead of the potentiometer, chip and magnetic steel in the aluminum alloy shell, by a shaft rotational magnetic steel, 0 to 5 v output is normal. But when in the outside with the same magnets close to aluminum shell, change output, outer magnetic steel left, output signal is not return!