Electronic Circuits and Tutorials
Stepper Motor Tutorial
Resistance Limited (R/L)
R/L (resistance/limited) drivers are, by today's standards, old technology but still exist in some (low power) applications because they are simple and inexpensive. The drawback to using R/L drivers is that they rely on a "dropping resistor" to get almost 10 times the amount of motor current rating necessary to maintain a useful increase in speed. This process also produces an excessive amount of heat and must rely on a DC power supply for it's current source.
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