Operating on 12 Vdc and 24 Vdc, respectively, battery-powered Models KBBW-12 and KBBW-22 provide optimal dynamic response to load variations. Motor speed can be controlled by 5 kΩ potentiometer, 0–5 Vdc analog signal, or PWM microprocessor output signal. PWM waveform produces almost pure DC current to motor which provides low audible motor noise and extended brush life. Providing short circuit protection, pulse-by-pulse current limit prevents control damage due to shorted motors.