A circuit is described for controlling the output current of a high current (100 amp) dc generator driving a low impedance (2.5 ohm, 40 mh) load. The circuit features precise continuous control of the load current by a single dial potentiometer over the range from zero to full output, with 0.03 percent linearity of currentvspotentiometer setting. A method is presented for reduction of current ripple from the generator in the low impedance load.