Author circuit used for telescope control CNC, robotics and so on. via LPT port can be used in similar projects using circuit has 3 channels Somebody SN74LS08 in other parts used in the SAA1042 stepper motor driver outputs are... Electronics Projects, SAA1042 SN74LS08 For Telescope Motor Drive Circuit "motor control circuit, motor driver circuit, " Date 2019/08/03