New CNC 2 Phase Hybrid Stepper Motor Driver Controller FMD2740C 40V/4A/128Product DescriptionHigh performance, low priceConstant current chopping driving technologySupply voltage 12~40VDCHigh-speed optocoupler signal isolation imput.20Khz chopping wave frequencySubdivision accuracy 1,2,4,8,16,32,64,128 choosableImput electrical signal TTL compatibilityAutomatic current halving in restEasy to assemble in terms of appearance desighMaximum driving current: 4ACould drive any two or four-phase hybrid stepping motor with 4A phase one time.