B IN4003 IN4003 GND 9 VDC C IN4003 IN4003 A 9 VDC 1 kΩ 1 kΩ experiment. control speed motor DC 1 kΩ 1 kΩ for diagram Port B, Pin 0 PIC 18F4331 Port B, Pin 1 Circuit 11.31: FIGURE 797