Profile: 4 Q D Motor Control manufactures motor speed controllers for battery operated electric motors. Our Pro(grammable)-150 motor controller is fully programmable and includes a display and programmer, as well as a sounder which (with the display) shows indication of any faults found in the system. Our 2QD is a simple motor speed controllers for 12v, 24v, 36v and 48v battery operation. They are two quadrant that is they control acceleration and braking. The controllers are MOSFET chopper drivers giving fully variable fine speed control of all motors at up to 100A intermittent. The controllers are primarily for mobile uses such as miniature railways, model cars, golf buggies and golf caddies but may be used for other applications as well. The controller is ideal for industrial purposes and is ideally suited for use as a building block where control is from a computer of similar system. Being an open circuit board with easy accessibility, they are also ideally suited to prototype and experimental work and to small quantity applications.