The compact D1 pulse width modulated driver from Enfield Technologies drives and manages a valve's linear force motor by converting proportional command voltage into a -1.1- to 1.1-A current signal. Valve deadband, dither amplitude, and maximum current are adjustable, and the D1 interfaces with the valve to minimize valve characterization and electronics application development. A digital closed-loop current control compensates for perturbations such as changes in input voltage and resistance. Other features include short circuit protection and LED indicators. Temperature range is -40 to +65°C (-40 to +150°F), and a 12- or 24-V dc power supply accommodates most applications. The unit’s enclosed format is suitable for panel-mount or exposed electronics systems, and a removable DIN clip permits rail or surface mounting.