9 DIRECT CURRENT PERMANENT MAGNET SERVO MOTORS, PRECISION DIRECT CURRENT MOTOR TACHOMETERS, DIRECT CURRENT SERVO AMPLIFIERS, POWER OPERATIONAL AMPLIFIERS, ELECTRONIC ALTERNATING CURRENT TO DIRECT CURRENT POWER SUPPLIES, ANALOG SPEED/POSITION CONTROL SYSTEMS COMPRISING AN ELECTRONIC ALTERNATING CURRENT TO DIRECT CURRENT POWER SUPPLY, CONTROLLER AND DIRECT CURRENT MOTOR/TACHOMETER AND DIGITAL SPEED/POSITION CONTROL SYSTEMS COMPRISING AN ELECTRONIC ALTERNATING CURRENT TO DIRECT CURRENT POWER SUPPLY, CONTROLLER, DIGITAL INPUT CARD, AND A SERVO MOTOR/TACHOMETER/ENCODER ASSEMBLY