Chdzi poprostu oto z jakiej firmy one pochodza...
Bo ich cena ( cena SSK-B04) jest zawrotna w stosunku np do sterownika ktory ma taka specyfikacje:
Features of this driver
􀁺 High performance, low cost
􀁺 Supply voltage up to +80VDC, current to 7.8A
􀁺 Inaudible 20khz chopping frequency
􀁺 TTL compatible and optically isolated input signals
􀁺 Automatic idle-current reduction
􀁺 Mixed-decay current control for less motor heating
􀁺 14 selectable resolutions in decimal and binary
􀁺 Microstep resolutions up to 51,200 steps/rev
􀁺 Suitable for 4,6,8 lead motors
􀁺 Over-current, over-voltage and short-circuit protection
􀁺 Small size (119 x 97 x 48mm)