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Any circuit for driving a motor that's more complex than wiring it to a power source through a simple on/off switch. Examples include speed and torque control using H-bridges, brushless motor controllers, stepper controllers, VFDs. Constant speed examples include relay control, reversing, reduced-voltage starting, overload protection and other control requirements more complex than a simple 0n/off switch.
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4-20mA output from Arduino
As mentionned by AKR, 4 to 20mA loop are define by multiple international standards. ISA-50 specifies 3 classes L, H and U with U being the more generic and specifiying that the transmitter need to be …