DC speed controls provide adjustable acceleration and deceleration. Take a look at the features for Dart Controls DC Speed Control. Voltage Output: 0 to 11/22VDC, Enclosure: Chassis.FeaturesMount Type: Compact PanelDC Speed Control: PWMShunt Wound Volts: 10/20VDCWidth: 2.8"Accepts Tach Feedback: NoEnclosure: ChassisSpeed Regulation: +/-1% of Base SpeedHP @ Lower Volts: 1/40Item: DC Speed ControlRotation: ReversableIncludes: Speed PotentiometerHeight: 1.3"Follower Circuit: NoFor Use With: Material Handling, Laboratory, Food Processing, Pump, Fan/Blower, Conveyor, Machine Tool, DC Motor and Spooling ApplicationsAC Input Voltage: 12/24VACLinear Acceleration: Fixed 0.5 sec.IR Compensation: AdjustableOperating Temp.: -10 Degrees to 45 Degrees CVoltage Output: 0 to 11/22VDCSpeed Range: 25:1HP @ Higher Volts: 1/20Standards: cULus RecognizedExternal Switches: NoneMax. Amps: 2Depth: 3.3"