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6N137 highspeed OptoCouple to ensure high speed without losing steps
for 42 57 86 Stepper within 3A 2/4 phase / 4 wire / 6 wire stepper motor
automatic halfdecay
excitation mode: synchronizing half step 1/8 step 1/16 step
current level is adjustable to meet your application needs
large heat sink for good heat dissipation
overheating and overcurrent protection circuit to ensure optimal performance