What I do is a two-phase stepping motor drive, 89s 52+CPLD =>；; Keying output pulse (square wave) sent to the driver, large current? How old is it? The current of our driver is adjusted to 6A, but the driver will be very hot after a long time. What do you mean by extra money? I'll just say mine, EDA motherboard+core board 490, drive about 700, motor 1000, and a transformer I'm not sure about. It's estimated to be 400 yuan, and there's an experimental board I drew for plastic surgery for 20 yuan.