When the ship's lifting motor is in the wiring, do not build any motor control circuit on the coiling or inserting prototype board. It is very important to prevent pulse jitter by using high frequency printed circuit wiring. Usually because of excessive noise in the input of the current detection sensor or error signal amplifier. Therefore, the printed circuit layout should have a small current signal and a high-drive output buffer to the ground, and should be returned to the power input filter capacitance through a separate channel. If the VCC, Vref, and error amplifiers are the same to the input, whether or not they need to receive a ceramic dielectric capacity (0.01 mu F) near the integrated circuit, the visual circuit layout is determined. However, all large current circuits should be as short as possible and should be used as long as possible to minimize EMI radiation.