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Digital techniques are displacing analogue techniques in the electronics field and a parallel trend in the rotating machine field is the increasing use of stepping motors. The principles of operation of stepping motors are outlined and the requirements of the power supply, which are closely bound to the motor characteristics and cannot be considered in isolation, are discussed. The main types of circuit and their operating features, relative advantages and disadvantages, typical circuit diagrams and measures adopted to achieve compromise between motor performance and power supply cost are briefly discussed.